The scaffolding will start to appear a few villagers short of the maximum for the current housing (except the total maximum!) so in some cases the villagers will have a chance to build the huts before you are ready to breed more villagers.
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Red Sox--2007 World Champions!
Celtics--2008 NBA Champions!

Isola is a magic island! All sorts of strange things can happen, and often do happen. -- arnie