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FFccCChhaarrSSeett ** FFccCChhaarrSSeettSSuubbttrraacctt ((ccoonnsstt FFccCChhaarrSSeett **_a,, ccoonnsstt FFccCChhaarrSSeett **_b));;
DESCRIPTION
Returns a set including only those chars found in _a but not _b.
VERSION
Fontconfig version 2.6.0