Since many-to-one substitutions are not covered, ligatures would not appear in this table unless they were variant forms of another ligature. This serves several purposes: An application may not support the feature by which the desired glyph would normally be accessed the user may need a glyph outside the context supported by the normal substitution, or the user may not know what feature produces the desired glyph. Function: This feature makes all variations of a selected character accessible.
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