ISO/IEC 14496-22 'Open Font Format' (2nd ed.)
With ordinary OFF font files, the only way to include the common kanji glyphs is to copy their glyph data into each font. Since the kanji represent much more data than the kana, this results in a great deal of wasteful duplication of glyph data. TTCs were defined to solve this problem. The CFF rasterizer does not currently support TTC files. ................
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