Task: Program Execution
Input (English): R, S, A, C, I
Output (English): [['R', 'S', 'A', 'C'], ['R', 'S', 'A', 'I'], ['R', 'S', 'C', 'I'], ['R', 'A', 'C', 'I'], ['S', 'A', 'C', 'I']]