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Why not use number names? O=0 I=1 Z=2 L=3 T=4 S=5 J=6

That could work for O, I, Z, and S; maybe L could be 7, but not the other tetriminoes. It's best to use letters. 11:26, 1 August 2017 (PDT)
That was 2014 edit. I was dumber at that time. Piotr Grochowski 11:43, 1 August 2017 (PDT)