From: Nanyang Zhan <superxain@...>
Date: 2010-01-05T14:08:00+09:00
Subject: How to generate a collection?

Given any four letter word, for example: "card"
Replace one to three letters with "~",
How can I get the result collection ( ["~ard", "c~rd", ..., "~~r~",
"~~~d"])?
I know ruby, but I am bad at any algorithms, help please.
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