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@observed = ("ab", "ab", "ad", "an", "bd", "bn", "dn");

@perms = ("aa", "ab", "ac", "ad", "ae", "af", "ag", 
                 "an", "ba", "bd", "bh", "bn", "dn");
# @perms would never be something like this, 
# but just to give an example

(0, 2, 0, 1, 0, 0, 0, 
 1, 0, 1, 0, 1, 1)