Question 1
In a 6×6 matrix (row0-5, col0-5) containing letters A-Z and digits 0-9 in row-major order, encode 'SECRET' by giving row and column numbers concatenated.
Position mapping: S→(3,0) E→(0,4) C→(0,2) R→(2,5) E→(0,4) T→(3,1) → 300402250431