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Illustrator 6/8 EPS files whose PostScript can't be run (the Adobe_level2_AI5 procset is provided by the RIP, not embedded) are read through their private layer data instead. That reader aborted the whole file when a text object carried the hyphenation/tab-ruler operators `Th` (hyphen control), `XL` (hyphenation language) and `Xb`/`XB` (a tab definition, with `Xe` descriptions between them), reporting them as operators it doesn't know. These carry no geometry, so drop them like the sibling type attributes the reader already discards (§22 of the Illustrator File Format Specification) rather than failing the import.