There are several bugs in the testsuite:
1) You cannot call cyp((x,y)) with double parantheses (occures twice)
2) for x='97256528638204' the string is too short. Likely there is a leading zero missing.
A few of the errors have been fixed, but this problem is too cryptic (or erroneous) for me to understand it, so I can't completely fix it. @Sibi, please fix the problem. I would highly recommend providing your own reference solution on the Edit page to ensure that it is working properly.
Make a checkerboard matrix
Remove the air bubbles
Snakes on a plane
Sum of first n terms of a harmonic progression
Decipher the number 2 - 3 keys
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