Light A is only on if light B is also on. Light C is always off when Light B is on. Light D is always off when light A is on. Light D is currently on. What can be currently said about the state of lights?
Only that light D is currently on.
Lights A and B are off
Light C is on and Lights A and B are off
Light C is off
Answer: Only that light D is currently on.
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