CharAssociation is used to maintain a backpointer from a glyph to one or more character intervals from which the glyph was derived. Each glyph in a glyph sequence is associated with a single CharAssociation instance. A CharAssociation instance is additionally (and optionally) used to record predication information about the glyph, such as whether the glyph was produced by the application of a specific substitution table or whether its position was adjusted by a specific poisitioning table.
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