BCMs -- gender help!

Im new to the whole chicken thing but my BCMs have been the most obvious as far as sexing goes...At two weeks it was pretty obvious! lol
 
here is mine with bad copper coloring... at 10 weeks, I think pullet... color would tell me otherwise. it is the black one in left corner.
 
How do you know for sure at ~6 weeks? I have a BCM who is that age and have no clue. Here he/she is:
 

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