Set union of two arrays

returns
the combined data from `C`

= union(`A,B`

)`A`

and `B`

with
no repetitions. `C`

is in sorted order.

If

`A`

and`B`

are tables or timetables, then`union`

returns the combined set of rows from both tables. For timetables,`union`

takes row times into account to determine equality, and sorts the output timetable`C`

by row times.

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