git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3172 c06c8d41-db1a-0410-9941-cceddc491573
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// do 'normal' building. Well, except for the swamp.
// do 'normal' building. Well, except for the swamp and shoals.
// time to make the swamp {dlb}:
// time to make the swamp or shoals {dlb}: