If the second argument is a +, then the two sets are merged. If the second argument is -, the elements in set2 are removed from set1.
If the second argument is the word "in", then it is tested, whether elements of set 1 are also contained in set 2.
The number of common elements will be the result in that case.
If the first argument is the character # (must be escaped in shell scripts, e.g. write '#'), the result is the number of elements in the set given as second argument. Number set specifiers should not contain whitespace and may consist of numbers, commas and dashes.
prompt# __numset 1-3,5-9,14 + 10-12
prompt# __numset 1-3,5-9,14 - 5-13
prompt# __numset 3 - ""
prompt# __numset 3 - 3-5
prompt# __numset # 4-9
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