flatten a list containing lists of elements
The Flatten(L) function recursively converts any elements in a list which are of type list to expression sequences.
The Flatten(L, N) function flattens a nested list of lists N times.
Note: The inlined procedure FlattenOnce⁡L is more efficient than a call to Flatten(L, 1).
L ≔ 1,2,3,4,5,6
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