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Horizontal type keeps both marks, and the legacy .ai writer writes such type as text, but the marks were dropped without a warning. Version 7 text has operators for both (section 15.3.4 of the published format specification): Tv for Roman characters upright in vertical writing, and TY for a Kumi block in horizontal text recorded for later vertical use. The writer now writes 1 Tv and 0 Tv, and 1 TY and 0 TY, where a run's mark changes, closes an open Kumi block before the text object ends, and writes neither operator for type without the marks. The legacy .ai reader reads both back onto the same characters. The prolog defines Tv and TY so the file still runs as PostScript.