| Return the character equivalence class of 'c'.
This is used by findLeft() and findRight() which operate such that
a word is bounded by a change in character class.
A character equivalence class is characterised by a number, any number,
that is different from numbers for other character classes. For example,
this implementation, which is used as the default WordDelineator for
Term returns 1 for spaces and 0 for everything else.
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