Question 1
In a 6×6 matrix (row0-5, col0-5) containing letters A-Z and digits 0-9 in row-major order, encode 'CIPHER' by giving row and column numbers concatenated.
Position mapping: C→(0,2) I→(1,2) P→(2,3) H→(1,1) E→(0,4) R→(2,5) → 021223110425