[ Bulbs A and C ] [ are ] [ still ] [ in closed paths ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ Terminal 2 and the positive terminal ] [ are separated ] [ by the gap ] 
[ The terminals ] [ are ] [ in the same state. ] 
[ The switch and the bulb ] [ have to be ] [ in the same path ] 
[ Terminals 1 and 2 ] [ are ] [ in the same electrical state ] 
[ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] 
[ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] 
[ The battery ] [ is contained ] [ in a path ] [ which ] [ does not contain any other components ] 
[ there ] [ is ] [ a gap ] [ in the circuit ] 
[ Bulb C ] [ is ] [ in a separate path ] 
[ Terminals 1 and 2 ] [ are connected ] 
[ there ] [ is ] [ a path ] [ containing ] [ A ] [ and ] [ a different path ] [ containing ] [ B and C ] 
[ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] 
[ there ] [ is ] [ an open path ] 
[ Terminal 4 and the positive terminal ] [ are not separated ] [ by the gap ] 
[ If ] [ bulb A ] [ burns out, ] [ neither B nor C ] [ is ] [ in a closed path ] 
[ Terminal 6 and the positive terminal ] [ are connected ] 
[ the battery ] [ is ] [ in an open path ] 
[ The battery ] [ in 2 ] [ is not ] [ in a closed path ] 
[ The battery ] [ is contained ] [ in a path ] [ which ] [ does not contain ] [ any other components ] 
[ there ] [ is ] [ a gap ] [ in a circuit ] 
[ bulbs A and B ] [ are ] [ still ] [ in closed paths ] [ with the battery ] 
[ Bulb A ] [ was ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] 
[ Bulb B ] [ is ] [ in a separate path ] 
[ The battery ] [ in 2 ] [ is not ] [ in a closed path ] 
[ Bulb A ] [ was ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] 
[ Terminal 2 and the positive terminal ] [ are separated ] [ by the gap ] 
[ A and C ] [ are ] [ in different paths ] [ with the battery ] 
[ each bulb ] [ is ] [ in its own path ] 
[ Bulb A ] [ is ] [ still ] [ in a closed path ] [ with the battery ] 
[ If ] [ bulb A ] [ burns out, ] [ neither B nor C ] [ is ] [ in a closed path ] 
[ bulbs B and C ] [ are ] [ still ] [ in closed paths ] [ with the battery ] 
[ Bulbs A and C ] [ are ] [ still ] [ in closed paths ] [ with the battery ] 
[ Terminal 1 and the positive terminal ] [ are not connected ] 
[ Bulb A ] [ is ] [ still ] [ contained ] [ in a closed path ] [ with the battery and switch Z. ] 
[ Terminal 5 and the positive terminal ] [ are connected ] 
[ Terminal 6 and the positive terminal ] [ are connected ] 
[ there ] [ is ] [ a short circuit ] 
[ If ] [ bulb A ] [ burns out, ] [ neither B nor C ] [ is ] [ in a closed path ] 
[ A non-zero voltage ] [ means ] [ that ] [ there ] [ is ] [ a gap ] 
[ The battery ] [ is contained ] [ in a closed path ] [ which ] [ does not contain ] [ any other components ] 
[ Terminals 1 and 4 ] [ are connected ] 
[ Terminals 1 and 4 ] [ are connected ] 
[ Terminal 5 and the positive terminal ] [ are not separated ] [ by the gap ] 
[ Measuring ] [ voltage ] [ indicates ] [ whether ] [ two terminals ] [ are separated ] [ by a gap. ] 
[ Terminal 2 and the positive terminal ] [ are separated ] [ by the gap ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] 
[ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] 
[ B and C ] [ are ] [ in the same path ] 
[ the terminals ] [ are not connected ] 
[ there ] [ is ] [ no gap ] [ between the terminals ] 
[ A and C ] [ are not ] [ in the same path ] [ with the battery ] 
[ the battery ] [ is ] [ in an open path ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ If ] [ bulb A ] [ burns out, ] [ bulbs B and C ] [ are ] [ still ] [ in a closed path ] 
[ A non-zero voltage ] [ means ] [ that ] [ the terminals ] [ are not connected. ] 
[ Terminal 6 and the positive terminal ] [ are connected ] 
[ Terminal 6 and the positive terminal ] [ are connected ] 
[ terminal 1 ] [ is connected ] [ to the negative battery terminal ] 
[ Terminal 6 and the positive terminal ] [ are connected ] 
[ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] 
[ A and C ] [ are ] [ in different paths ] 
[ bulbs A and B ] [ are ] [ still ] [ in closed paths ] [ with the battery ] 
[ Terminal 6 and the positive terminal ] [ are not separated ] [ by the gap ] 
[ If ] [ bulb A ] [ burns out, ] [ neither B nor C ] [ is ] [ in a closed path ] 
[ A and C ] [ are ] [ in different paths ] [ with the battery ] 
[ Terminal 4 and the positive terminal ] [ are connected ] 
[ If ] [ C ] [ burns out, ] [ then ] [ A and B ] [ are ] [ still ] [ in a closed path. ] 
[ If ] [ C ] [ is ] [ damaged, ] [ A and B ] [ are ] [ still ] [ in a closed path ] 
[ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] 
[ terminal 1 ] [ is connected ] [ to the negative battery terminal ] 
[ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] 
[ Terminal 1 and the positive terminal ] [ are not connected ] 
[ Terminal 6 and the positive terminal ] [ are connected ] 
[ Bulb A ] [ is ] [ still ] [ contained ] [ in a closed path ] [ with the battery. ] 
[ Terminal 4 and the positive battery terminal ] [ are in the same electrical state ] 
[ Bulb C ] [ is ] [ in a separate path ] 
[ Measuring ] [ voltage ] [ indicates ] [ the place ] [ where ] [ the electrical state ] [ changes ] [ due to ] [ a damaged bulb. ] 
[ there ] [ is ] [ a closed path ] [ containing ] [ both ] [ the bulb and a battery ] 
[ there ] [ is ] [ an incomplete circuit ] 
[ there ] [ is ] [ no closed path ] 
[ Terminals 1, 2 and 3 ] [ are connected ] [ to the negative battery terminal ] 
[ each bulb ] [ is ] [ in its own path ] 
[ There ] [ is ] [ a gap ] [ between terminals 1 and 6 ] 
[ Bulb B and Bulb C ] [ were ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] 
[ If ] [ a bulb and a switch ] [ are ] [ in the same path ] [ the switch ] [ affects ] [ the bulb ] 
[ Terminal 4 and the positive battery terminal ] [ are ] [ in the same electrical state ] 
[ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] 
[ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] 
[ there ] [ is ] [ a path ] [ containing ] [ both ] [ Z and C ] 
[ The damaged bulb and the other bulb ] [ must be contained ] [ in the same path ] 
[ Bulb A ] [ was ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] 
[ A and C ] [ are ] [ in the same closed path ] 
[ the open switch ] [ creates a gap ] 
[ the terminals ] [ are separated by a gap ] 
[ there ] [ is ] [ a short circuit ] 
[ bulb B ] [ creates ] [ a gap ] 
[ Terminal 3 and the positive terminal ] [ are not connected ] 
[ Terminal 4 and the positive terminal ] [ are not separated ] [ by the gap ] 
[ terminal 1 ] [ is connected ] [ to the negative battery terminal ] 
[ Terminals 1 and 2 ] [ are connected ] 
[ Terminal 2 and the positive terminal ] [ are separated ] [ by the gap ] 
[ terminal 1 ] [ is connected ] [ to the negative battery terminal ] 
[ Terminal 4 and the positive battery terminal ] [ are ] [ in the same electrical state ] 
[ Terminal 1 and the positive terminal ] [ are not connected ] 
[ bulbs A and B ] [ are ] [ still ] [ in closed paths ] [ with the battery ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ Terminals 1 and 4 ] [ are connected ] 
[ Terminal 4 and the positive terminal ] [ are connected ] 
[ Terminals 1 and 2 ] [ are connected ] 
[ Terminal 2 and the positive terminal ] [ are not connected ] 
[ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] 
[ The bulb ] [ is not ] [ in the closed path ] [ containing ] [ the battery ] 
[ the terminals ] [ are separated ] [ by a gap ] 
[ Terminal 6 and the positive terminal ] [ are connected ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ The battery ] [ in 4 ] [ is not ] [ in a closed path ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ there ] [ is ] [ a path ] [ containing ] [ A ] [ and ] [ a different path ] [ containing ] [ B and C ] 
[ there ] [ is ] [ no path ] [ containing ] [ both ] [ switch Y and bulb A ] 
[ a damaged bulb ] [ creates ] [ a gap ] 
[ there ] [ is ] [ a short circuit ] 
[ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] 
[ Terminal 5 and the positive terminal ] [ are connected ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ Terminals 1 and 2 ] [ are ] [ in the same electrical state ] 
[ B and C ] [ are ] [ in the same path ] [ with the battery ] 
[ the path is not closed ] 
[ Terminal 1 and the positive terminal ] [ are not connected ] 
[ The battery ] [ in 2 ] [ is not ] [ in a closed path ] 
[ Terminal 5 and the positive terminal ] [ are connected ] 
[ there ] [ is ] [ a path ] [ containing ] [ A, C, Z and X ] 
[ Terminal 2 and the positive terminal ] [ are separated ] [ by the gap ] 
[ The battery ] [ in 2 ] [ is not ] [ in a closed path ] 
[ the terminals ] [ are not separated ] [ by a gap ] 
[ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] 
[ Bulb B and Bulb C ] [ were ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] 
[ Circuit 4 ] [ has ] [ no closed paths ] 
[ Measuring ] [ voltage ] [ indicates ] [ the place ] [ where ] [ the electrical state ] [ changes ] [ due to ] [ a gap. ] 
[ A non-zero voltage ] [ means ] [ that ] [ the terminals ] [ are not connected. ] 
[ If ] [ C ] [ burns out, ] [ then ] [ A and B ] [ are still ] [ in a closed path ] [ with the battery. ] 
[ there ] [ is ] [ no gap ] [ between the terminals ] 
[ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] 
[ terminal 1 ] [ is connected ] [ to the negative battery terminal ] 
[ If ] [ a bulb and a switch ] [ are ] [ in the same path ] [ the switch ] [ affects ] [ the bulb ] 
[ The terminals ] [ are ] [ in the same state. ] 
[ The battery ] [ in 4 ] [ is not ] [ in a closed path ] 
[ Bulb A ] [ is ] [ still ] [ contained ] [ in a closed path ] [ with the battery and switch X. ] 
[ Bulb A ] [ is ] [ still ] [ contained ] [ in a closed path ] [ with the battery. ] 
[ there ] [ is ] [ a path ] [ containing ] [ both ] [ Z and C ] 
[ Bulb A ] [ is ] [ still ] [ contained ] [ in a closed path ] [ with the battery and switch X. ] 
[ Terminals 1, 2 and 3 ] [ are separated ] [ from the positive battery terminal ] [ by a gap ] 
[ Bulb A ] [ was ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] 
[ The battery ] [ in 4 ] [ is not ] [ in a closed path ] 
[ A and C ] [ are ] [ in the same closed path ] 
[ Bulb C ] [ is ] [ in a separate path ] 
[ If ] [ bulb A ] [ burns out, ] [ neither B nor C ] [ is ] [ in a closed path ] 
[ Terminal 1 and the positive terminal ] [ are not connected ] 
[ The battery ] [ in 2 ] [ is not ] [ in a closed path ] 
[ there ] [ is no gap ] [ between the terminals ] 
[ there ] [ is ] [ a closed path containing both the bulb and a battery ] 
[ Terminals 1 and 6 ] [ are not connected ] 
[ Bulb A ] [ is ] [ still ] [ contained ] [ in a closed path ] [ with the battery and switch X. ] 
[ If ] [ a bulb and a switch ] [ are ] [ in the same path ] [ the switch ] [ affects ] [ the bulb ] 
[ If ] [ bulb A ] [ burns out, ] [ bulbs B and C ] [ are ] [ still ] [ in a closed path ] 
[ Terminals 1, 2 and 3 ] [ are separated ] [ from the positive battery terminal ] [ by a gap ] 
[ The battery ] [ in 2 ] [ is not ] [ in a closed path ] 
[ The damaged bulb and the other bulb ] [ must be contained ] [ in the same path ] 
[ Terminal 6 and the positive terminal ] [ are connected ] 
[ the path ] [ is not closed ] 
[ bulbs B and C ] [ are ] [ still ] [ in closed paths ] [ with the battery ] 
[ If ] [ a bulb and a switch ] [ are ] [ in the same path ] [ the switch ] [ affects ] [ the bulb ] 
[ A and C ] [ are ] [ in the same path ] 
[ Switch Y and bulb A ] [ are not ] [ in the same closed path ] 
[ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] 
[ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] 
[ Switch Y and bulb A ] [ are not ] [ in the same closed path ] 
[ If ] [ C ] [ burns out, ] [ then ] [ A and B ] [ are ] [ still ] [ in a closed path ] [ with the battery. ] 
[ Bulb C ] [ was no longer ] [ in a closed path ] [ with the battery ] 
[ The terminals ] [ are ] [ in the same state. ] 
[ Bulb B ] [ is ] [ in a separate path ] 
[ A non-zero voltage ] [ means ] [ that ] [ the terminals ] [ are not connected. ] 
[ The battery ] [ in 4 ] [ is not ] [ in a closed path ] 
[ Measuring ] [ voltage ] [ indicates ] [ the place ] [ where ] [ the electrical state ] [ changes ] [ due to a gap. ] 
[ If ] [ C ] [ burns out, ] [ then ] [ A and B ] [ are still ] [ in a closed path. ] 
[ A and C ] [ are not ] [ in the same path ] [ with the battery ] 
[ Terminals 1 and 2 ] [ are ] [ in the same electrical state ] 
[ Bulb A ] [ is ] [ still ] [ in a closed path ] [ with the battery ] 
[ A and C ] [ are ] [ in the same closed path ] 
[ there ] [ is ] [ a path ] [ containing ] [ both ] [ Z and C ] 
[ there ] [ is ] [ no gap ] [ between the terminals ] 
[ Bulbs A and C ] [ are ] [ still ] [ contained ] [ in closed paths ] [ with the battery ] 
[ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] 
[ there ] [ is ] [ no gap ] [ between the terminals ] 
[ there ] [ is ] [ a path ] [ containing ] [ A ] [ and ] [ a different path ] [ containing ] [ B and C ] 
[ If ] [ C ] [ burns out, ] [ then ] [ A and B ] [ are ] [ still ] [ in a closed path ] [ with the battery. ] 
[ Terminal 6 and the positive terminal ] [ are connected ] 
[ Circuit 4 ] [ has no closed paths ] 
[ Measuring ] [ voltage ] [ indicates ] [ the place ] [ where ] [ the electrical state ] [ changes ] [ due to ] [ a gap. ] 
[ Measuring ] [ voltage ] [ indicates ] [ the place ] [ where ] [ the electrical state changes ] [ due to a gap. ] 
[ there ] [ is ] [ no closed path ] [ containing ] [ the battery ] 
[ there ] [ is ] [ a gap ] [ in a circuit ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ If ] [ a bulb and a switch ] [ are ] [ in the same path ] [ the switch ] [ affects ] [ the bulb ] 
[ there ] [ is ] [ no gap ] [ between the terminals ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ there ] [ is ] [ a complete circuit ] 
[ Bulb B and Bulb C ] [ were still contained ] [ in the same closed path ] [ with the battery. ] 
[ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] 
[ the terminals ] [ are not connected ] 
[ terminal 1 ] [ is connected ] [ to the negative battery terminal ] 
[ Switch Y and bulb A ] [ are not ] [ in the same closed path ] 
[ terminal 6 ] [ is separated ] [ by a gap ] [ from the negative battery terminal ] 
[ there ] [ is no gap ] [ between the terminals ] 
[ terminal 4 ] [ is separated ] [ by a gap ] [ from the negative battery terminal ] 
[ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] 
[ terminal 1 ] [ is connected ] [ to the negative battery terminal ] 
[ If ] [ a bulb and a switch ] [ are ] [ in the same path ] [ the switch ] [ affects ] [ the bulb ] 
[ B and C ] [ are ] [ in the same path ] [ with the battery ] 
[ Terminal 6 and the positive terminal ] [ are connected ] 
[ If ] [ C ] [ burns out, ] [ then ] [ A and B ] [ are ] [ still ] [ in a closed path. ] 
[ Terminal 5 and the positive terminal ] [ are connected ] 
[ The bulb ] [ is not ] [ in the closed path ] [ containing ] [ the battery ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ If ] [ bulb A ] [ burns out, ] [ bulbs B and C ] [ are ] [ still ] [ in a closed path ] 
[ If ] [ bulb A ] [ burns out, ] [ B and C ] [ are ] [ no longer ] [ in a closed path ] [ with the battery ] 
[ there ] [ is ] [ a short circuit ] 
[ Circuit 4 ] [ has ] [ no closed paths ] 
[ Terminals 1, 2 and 3 ] [ are connected ] [ to the negative battery terminal ] 
[ A and C ] [ are not ] [ in the same path ] 
[ A and C ] [ are not ] [ in the same path ] 
[ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] 
[ there ] [ is ] [ an incomplete circuit ] 
[ Circuit 4 ] [ has ] [ no closed paths ] 
[ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] 
[ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] 
[ Terminals 1 and 4 ] [ are connected ] 
[ If ] [ C ] [ burns out, ] [ then ] [ A and B ] [ are ] [ still ] [ in a closed path. ] 
[ Bulb A ] [ is ] [ still ] [ in a closed path ] [ with the battery ] 
[ B and C ] [ are ] [ in the same path ] [ with the battery ] 
[ terminal 1 ] [ is connected ] [ to the negative battery terminal ] 
[ The battery ] [ in 2 ] [ is not ] [ in a closed path ] 
[ Bulb A ] [ was ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] 
[ B and C ] [ are ] [ in the same path ] [ with the battery ] 
[ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] 
[ Terminal 3 and the positive terminal ] [ are separated ] [ by the gap ] 
[ A and C ] [ are ] [ in different paths ] [ with the battery ] 
[ Terminals 1, 2 and 3 ] [ are separated ] [ from the positive battery terminal ] [ by a gap ] 
[ Bulb C ] [ was not ] [ in a closed path ] 
[ the path ] [is not ] [ closed ]
[ Bulb A ] [ is ] [ still ] [ in a closed path ] [ with the battery ] 
[ Terminals 1 and 6 ] [ are not connected ] 
[ bulbs B and C ] [ are ] [ still ] [ in closed paths ] [ with the battery ] 
[ Terminals 1 and 6 ] [ are separated ] [ by the gap ] 
[ the battery ] [ is contained ] [ in a closed path ] [ in which ] [ there ] [ is ] [ no bulb ] 
[ there ] [ is ] [ a closed path ] [ containing ] [ both ] [ the bulb and a battery ] 
[ Bulb B ] [ is ] [ in a separate path ] 
[ Terminal 5 and the positive terminal ] [ are connected ] 
[ the terminals ] [ are not connected ] 
[ the battery ] [ is contained ] [ in a path ] [ in which ] [ there ] [ is ] [ no bulb ] 
[ the battery ] [ is ] [ in an open path ] 
[ there ] [ is ] [ an incomplete circuit ] 
[ The damaged bulb and the other bulb ] [ must be contained ] [ in the same path ] 
[ The battery ] [ in 2 ] [ is not ] [ in a closed path ] 
[ Bulb A ] [ was ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] 
[ The terminals ] [ are ] [ in the same state. ] 
[ B and C ] [ are ] [ in the same path ] [ with the battery ] 
[ the battery ] [ is contained ] [ in a closed path ] [ in which ] [ there ] [ is ] [ no bulb ] 
[ Terminals 1 and 6 ] [ are separated ] [ by the gap ] 
[ there ] [ is ] [ a gap ] [ in a circuit ] 
[ Bulb A ] [ is ] [ still ] [ contained ] [ in a closed path ] [ with the battery and switch Z. ] 
[ Bulb A ] [ is ] [ still ] [ in a closed path ] [ with the battery ] 
[ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] 
[ Bulb C ] [ was not ] [ in a closed path ] 
[ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ A, B and C ] [ are ] [ in different paths ] 
[ Terminals 1 and 6 ] [ are not connected ] 
[ the terminals ] [ are not connected ] 
[ Bulb A ] [ is ] [ still ] [ contained ] [ in a closed path ] [ with the battery and switch Z. ] 
[ If ] [ bulb A ] [ burns out, ] [ neither B nor C ] [ is ] [ in a closed path ] 
[ each bulb ] [ is ] [ in its own path ] 
[ If ] [ bulb A ] [ burns out, ] [ B and C ] [ are ] [ no longer ] [ in a closed path ] [ with the battery ] 
[ Terminals 1, 2 and 3 ] [ are separated ] [ from the positive battery terminal ] [ by a gap ] 
[ Terminal 4 and the positive terminal ] are not separated by the gap 
[ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] 
[ the path ] [ is not closed ] 
[ If ] [ bulb A ] [ burns out, ] [ neither B nor C ] [ is ] [ in a closed path ] 
[ each bulb ] [ is ] [ in its own path ] 
[ Bulb A ] [ was ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] 
[ Terminals 1 and 4 ] [ are connected ] 
[ Bulb C ] [ is ] [ in a separate path ] 
[ there ] [ is ] [ a complete circuit ] 
[ If ] [ a bulb and a switch ] [ are ] [ in the same path ] [ the switch ] [ affects ] [ the bulb ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ Bulb B and Bulb C ] [ were ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] 
[ there ] [ is ] [ a path ] [ containing ] [ A, C, Z and X ] 
[ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] 
[ There ] [ is no gap ] [ between terminal 6 and the positive terminal ] 
[ Bulbs A and C ] [ are ] [ still ] [ in closed paths ] [ with the battery ] 
[ Bulbs A and C ] [ are ] [ in a closed path ] 
[ Terminals 1, 2 and 3 ] [ are separated ] [ from the positive battery terminal ] [ by a gap ] 
[ the terminals ] [ are separated ] [ by a gap ] 
[ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] 
[ There ] [ is ] [ no path ] [ containing ] [ both ] [ switch Y and bulb A ] 
[ there ] [ is ] [ a path ] [ containing ] [ A, C, Z and the battery ] 
[ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] 
[ The battery ] [ in 2 ] [ is not ] [ in a closed path ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ A and C ] [ are ] [ in different paths ] [ with the battery ] 
[ Bulb A ] [ is ] [ still ] [ in a closed path ] [ with the battery ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ Bulbs A and C ] are [ still ] in closed paths 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] 
[ the bulb and the battery ] [ are ] [ in a closed path ] 
[ A and C ] [ are ] [ in different paths ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ The damaged bulb and the other bulb ] [ must be contained ] [ in the same path ] 
[ there ] [ is ] [ no path ] [ containing ] [ both ] [ switch Y and bulb A ] 
[ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] 
[ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] 
[ there ] [ is ] [ no gap ] [ between the terminals ] 
[ Terminals 4, 5 and 6 ] [ are not connected ] [ to the negative battery terminal ] 
[ If ] [ C ] [ burns out ] [ then ] [ A and B ] [ are ] [ still ] [ in a closed path ] [ with the battery ] 
[ A and C ] [ are ] [ in the same path ] 
[ A and C ] [ are ] [ in the same closed path ] 
[ If ] [ a bulb and a switch ] [ are ] [ in the same path ] [ the switch ] [ affects ] [ the bulb ] 
[ A and C ] [ are not ] [ in the same path ] [ with the battery ] 
[ Terminal 6 and the positive terminal ] [ are not separated ] [ by the gap ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ there ] [ is ] [ an incomplete circuit ] 
[ If ] [ C ] [ burns out ] [ then ] [ A and B ] [ are ] [ still ] [ in a closed path ] [ with the battery ] 
[ each bulb ] [ is ] [ in its own path ] 
[ the terminals ] [ are separated ] [ by a gap ] 
[ A and C ] [ are ] [ in the same closed path ] 
[ there ] [ is ] [ a short circuit ] 
[ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] 
[ If ] [ C ] [ burns out ] [ then ] [ A and B ] [ are ] [ still ] [ in a closed path ] [ with the battery ] 
[ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] 
[ there ] [ is ] [ a path ] [ containing ] [ both ] [ Z and C ] 
[ The battery ] [ is contained ] [ in a path ] [ which ] [ does not contain ] [ any other components ] 
