Given a string, e.g. "ABCD"

I need to come up with all combinations of letters
eg
ABCD
ABDC
ACBD
ACDB
....

And exlude strings like 'AAAA', 'AAAB' unless you pass a string with
duplicate characters
If I pass the string "AAAB" then it'd return:
AAAB
AABA
ABAA
BAAA

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