I don't understand. Isn't decyp() supposed to be called with 2 arguments? All the the test-suite problems call it with 1 argument, and therefore don't indicate whether it is supposed to cipher or decipher.
Other problems of this type (cipher/decipher from 2nd input) are called with 2 arguments.
If that was the intended way of solving this question, someone please fix the test suite.
The problem description has been cleaned up. Also, the test suite now calls the function with two inputs, as mentioned by William.
Based on a commented-out solution by Lincoln Poon, the problem appears to now be functional.
Make a checkerboard matrix
Project Euler: Problem 9, Pythagorean numbers
Make a list string
Generate a Parasitic Number
Side of a rhombus
find the index of local maximum in matrix
Cipher and Decipher the message - 3 key
Cipher or Decipher the number according to the second input - 1 key for all digits
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