17. In 16(a): for any x, 0 <= x <= 2, the points {x, -x + 2} are a 2-cycle.

In 16(b): for any x, 0 <= x <= 1, the points {x, -x + 1} are a 2-cycle.

There are no 2-cycles in 16(c) and 16(d).

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