+ """A class that unscrambles words quickly by computing a signature
+ (sig) for the word based on its position independent letter
+ population and then using a pregenerated index to look up known
+ words the same set of letters.
+
+ Note that each instance of Unscrambler caches its index to speed
+ up lookups number 2..N; careless reinstantiation will by slower.
+
+ Sigs are designed to cluster similar words near each other so both
+ lookup methods support a "fuzzy match" argument that can be set to
+ request similar words that do not match exactly in addition to any
+ exact matches.
+
+ """