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A transformation of period 2.

A relation R on a set S is transitive provided that for all x, y and z in S such that xRy and yRz, we also have xRz.

A transversal line is a line which intersects each of a given set of other lines. It is also called a semisecant.

A lottery in which three numbers are picked at random from the integers 1-14.

In the American system, 10^(42).

One of the four 3-polyaboloes.

A set with three elements.

An integer n which is tested to see if it divides a given number.

The unique 3-polyiamond, illustrated above.

A 13-sided polygon, sometimes also called the triskaidecagon.