git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3676 c06c8d41-db1a-0410-9941-cceddc491573
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// returns random2(x) is random_factor is true, otherwise// the mean.
// returns random2(x) is random_factor is true, otherwise
// the mean.
// Returns random2(x) is random_factor is true, otherwise the mean.