Task: Program Execution
Input (English): y, b, 7, 5, 1, c, i
Output (English): [['y', 'b', '7', '5', '1', 'c'], ['y', 'b', '7', '5', '1', 'i'], ['y', 'b', '7', '5', 'c', 'i'], ['y', 'b', '7', '1', 'c', 'i'], ['y', 'b', '5', '1', 'c', 'i'], ['y', '7', '5', '1', 'c', 'i'], ['b', '7', '5', '1', 'c', 'i']]