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.
Back and Forth Rows
Distance walked 3D
How to multiply?
Cipher and Decipher the message - same key for all digits
Decipher the message - same key for all digits
Rotate matrix by coloumns
Malus’ Law (theta) between polarizations
Cipher or Decipher the number according to the second input - 3 keys
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