output = UniqueNoSorting(sequence,mode)
SEQUENCE is a vector, MODE is a specification of how you want your output
to be not sorted.
Basically the same as unique, but returns the unique values either:
“in order of appearance” - (MODE = ‘first’ for ‘first occurrence’)
“in order of disappearance” - (MODE = ‘last’ for ‘last occurrence’)
MODE defaults to ‘first’
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