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CodingBat code practice ocpython > removeRepeats
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removeRepeats() -- Given a String s containing only lower-case characters, return a String t in which all except the first occurrence of each character has been removed. For example, removeRepeats("llama") should return "lam", and removeRepeats("abracadabara") should return "abrcd".

removeRepeats('llama') → 'lam'
removeRepeats('abracadabara') → 'abrcd'
removeRepeats('basketball') → 'basketl'

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def removeRepeats(s) :

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