distinct Function
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distinct
takes a list and returns a new list with any duplicate elements
removed.
The first occurrence of each value is retained and the relative ordering of these elements is preserved.
> distinct(["a", "b", "a", "c", "d", "b"]) [ "a", "b", "c", "d", ]
> distinct(["a", "b", "a", "c", "d", "b"])
[
"a",
"b",
"c",
"d",
]