Use strings instead of arrays.

Tie::File uses tied arrays, and (as far as I know) they are implemented in a way that not all of their elements are held in memory at the same time.

In reply to Re^2: Question regarding Tie::File or a better way to handle huge 2-D arrays by betterworld
in thread Question regarding Tie::File or a better way to handle huge 2-D arrays by Benbo

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