Python test cases seem to contradict themselves on duplcation. The simple test cases say we shouldn't allow duplications, ex:

[['cheese'], ['rat', 'rat', 'tar'], ['star', 'tars', 'tsar']] should equal [['cheese'], ['rat', 'tar'], ['star', 'tars', 'tsar']]

while the random tests allow lots of duplication, see the ['Mm', 'mM'] failure below

[['AQipcR', 'ARciQp', 'ARicQp', 'AipcQR', 'ApcQiR', 'QcApiR', 'QpAcRi', 'QpiRcA', 'RQpAic', 'RcApiQ', 'RpiQAc', 'cARiQp', 'cRpQAi', 'pRAciQ'], ['BpUDwoj', 'BpUowjD', 'BwUDopj', 'DoBwjUp', 'DpwUjoB', 'DwoBpjU', 'UpjwoDB', 'UwjopBD', 'jBUwDop', 'oUwDjBp', 'opBjUwD', 'opjUBDw', 'pUjwoBD', 'pjDBoUw', 'pjowUDB', 'poBUjwD', 'wUBjoDp', 'wUjBDpo'], ['BwUDopj', 'DUpBwoj', 'pUjwoBD'], ['CiboySMp', 'MoCpibSy', 'MpSboiCy', 'bCMyiopS', 'ipboySCM', 'oCiSpybM', 'oiMbSpCy', 'oypbCiSM', 'pCMyiobS', 'yiCpoMbS', 'yoCMSibp', 'ypCSbMio'], ['FPcusOuzT', 'FPsOuzTcu', 'FczuTusPO', 'OuPucFszT', 'OuuczFTsP', 'PFOuzucsT', 'PuTFucOzs', 'cFOTPuzsu', 'cTuzuPOFs', 'csuuzTFPO', 'sFuPzuTOc', 'uPOFTczsu', 'uzuFOPcTs', 'zOcFsTuPu', 'zcsPuFOuT'], ['Mm', 'mM']]

should equal

[['AQipcR', 'ARciQp', 'ARicQp', 'AipcQR', 'ApcQiR', 'QcApiR', 'QpAcRi', 'QpiRcA', 'RQpAic', 'RcApiQ', 'RpiQAc', 'cARiQp', 'cRpQAi', 'pRAciQ'], ['BpUDwoj', 'BpUowjD', 'BwUDopj', 'DUpBwoj', 'DoBwjUp', 'DpwUjoB', 'DwoBpjU', 'UpjwoDB', 'UwjopBD', 'jBUwDop', 'oUwDjBp', 'opBjUwD', 'opjUBDw', 'pUjwoBD', 'pjDBoUw', 'pjowUDB', 'poBUjwD', 'wUBjoDp', 'wUjBDpo'], ['CiboySMp', 'MoCpibSy', 'MpSboiCy', 'bCMyiopS', 'ipboySCM', 'oCiSpybM', 'oiMbSpCy', 'oypbCiSM', 'pCMyiobS', 'yiCpoMbS', 'yoCMSibp', 'ypCSbMio'], ['FPcusOuzT', 'FPsOuzTcu', 'FczuTusPO', 'OuPucFszT', 'OuuczFTsP', 'PFOuzucsT', 'PuTFucOzs', 'cFOTPuzsu', 'cTuzuPOFs', 'csuuzTFPO', 'sFuPzuTOc', 'uPOFTczsu', 'uzuFOPcTs', 'zOcFsTuPu', 'zcsPuFOuT'], ['Mm', 'Mm', 'Mm', 'Mm', 'Mm', 'Mm', 'Mm', 'Mm', 'mM', 'mM', 'mM', 'mM', 'mM', 'mM', 'mM', 'mM', 'mM', 'mM', 'mM', 'mM']]

Cool kata, but there is critical flaw in edge cases tests, where we asserts that
["aaA", "Aaa", "aaa"] equals [["aaA", "Aaa"], ["aaa"]].
It is wrong, the right answer should be [["aaA", "Aaa", "aaa"]], because anagrams are case insensitive by its nature, referring to related Wikipedia article https://en.wikipedia.org/wiki/Anagram :
"Listen" is valid anagram for "Silent" vice versa, despite that 'l' and 's' letters have different cases in both words.
Same is relevant for these examples as well:
"New York Times" = "monkeys write"
"Church of Scientology" = "rich-chosen goofy cult"
"McDonald's restaurants" = "Uncle Sam's standard rot"
and more on. Please fix that test case!

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