Normally we would now make 9 turns of the handle with the carriage in position 1 and 8 turns with the carriage in position 2, that is altogether 17 turns of the handle. The same calculation can be done, however, with only 3 turns of the handle. 89 = (100-11) or (-11 + 100). We therefore calculate 457 x (-1-10+100).
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