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Thanks Haiku

In and out, like the tides, I go.  
Past the jaws, I move to and fro.  
If you lose me, find me fast, 
Or else my loss will be your last.  
Question : What am I?

Pronounced as one letter and written as three.
Two letters there are and two only in me.
I'm double; I'm single. I'm black, blue, and gray.
I'm read from both ends and same either way.
Question : What is it?

See answer

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