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Combining Lists

Join[list1,list2,...]concatenate lists together
Union[list1,list2,...]combine lists, removing repeated elements and sorting the result
Riffle[list1,list2]interleave elements of list1 and list2

Functions for combining lists.

Join concatenates any number of lists together.
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Union combines lists, keeping only distinct elements.
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Riffle combines lists by interleaving their elements.
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