From: "Sebastjan H." <lists@...>
Date: 2012-05-02T14:52:27+09:00
Subject: array of strings - finding letter combinations

Hi All,

I am new to ruby and I want to learn by examples and here is one from my
everyday work. I have an array of strings where each string contains a
combination of an ampersand and a letter (&e). The trick is, this
combination may only appear once in the whole array, so none of the
other strings may contain the same combination.

I need to solve this problem so that ruby would suggest a possible and
not yet taken combination where duplicates occur. In case where no more
possible combinations exist, an error would be raised.

My question is: could someone give me some general pointers how would I
achieve this (just enough to get me going:)

Thank you kindly.

regards
seba

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