The following is easy but interesting. A "set" is a numeric vector without repetitions. Provide definitions for the union u and intersection n of two sets:
1 2 3 4 u 3 4 5 6 NB. elements of one or the other
1 2 3 4 5 6
1 2 3 4 n 3 4 5 6 NB. common elements
3 4
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