Crossword validation as Pick One

Hello community, I´ve just developed a crossword with a counter variable and two hidden buttons (hidden from slide) with KO and OK select to submit interaction Pick One. The trouble is when I solve the crossword. Although I introduce the correct letters in each one space, the submit shows incorrect all the time. So, please I need help with this because the client need to develop other similar resources.

Below this message I am attaching story file and correct answers file (to make it easy to try). 

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