I want to count the number of occurences of each character in a string
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        Published on 2010-04-24T03:18:27Z
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            2010/04/24
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Ignore spaces, punctuation and anything else that is not a letter. Ignore the case of the incoming letters (so e.g. 'A' and 'a' should be counted together). The results of analysing this string should be added to any analysis performed by previous calls to this method.
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