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From the TeXbook, page 286, last but one bullet point: ⟨letter⟩, ⟨otherchar⟩, \char⟨8-bit number⟩, ⟨chardef token⟩, \noboundary. The most common commands of all are the character commands that tell TeX to append a character to the current horizontal list, using the current font. [...] In unrestricted horizontal mode, a ‘\discretionary{}{}{}’ ...


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