for x1 in (1, 2): for x2 in (3, 4): for y1 in (5, 6): for y2 in (7, 8): print(f'x1: {x1} x2: {x2} y1: {y1} y2: {y2}')
Standard input is empty
x1: 1 x2: 3 y1: 5 y2: 7 x1: 1 x2: 3 y1: 5 y2: 8 x1: 1 x2: 3 y1: 6 y2: 7 x1: 1 x2: 3 y1: 6 y2: 8 x1: 1 x2: 4 y1: 5 y2: 7 x1: 1 x2: 4 y1: 5 y2: 8 x1: 1 x2: 4 y1: 6 y2: 7 x1: 1 x2: 4 y1: 6 y2: 8 x1: 2 x2: 3 y1: 5 y2: 7 x1: 2 x2: 3 y1: 5 y2: 8 x1: 2 x2: 3 y1: 6 y2: 7 x1: 2 x2: 3 y1: 6 y2: 8 x1: 2 x2: 4 y1: 5 y2: 7 x1: 2 x2: 4 y1: 5 y2: 8 x1: 2 x2: 4 y1: 6 y2: 7 x1: 2 x2: 4 y1: 6 y2: 8