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It means you can go ahead and practise putting in the dark (5,5)

Ross

I believe the answer is:

green light

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But I can't explain it at all! Could you help me understand?

(Other definitions for green light that I've seen before include "Go-ahead" , "What one has to go on" , "Given permission to proceed" , "Signal for go" , "something to go on" .)

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