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Assign each switch a number.
With switch #1 & switch #2 down, light is on or off?
With #1 up & #2 down, light is on or off?
With #1 down and #2 up, light is on or off?
With #1 & #2 up, light is on or off?
In principle, with the answers filled in, the problem(s) can be pinpointed.
Test cases welcome. . .
With switch #1 & switch #2 down, light is on or off?
With #1 up & #2 down, light is on or off?
With #1 down and #2 up, light is on or off?
With #1 & #2 up, light is on or off?
In principle, with the answers filled in, the problem(s) can be pinpointed.
Test cases welcome. . .