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macros - Fully robust way to access the first item in a token list (expandably) - TeX - LaTeX Stack Exchange
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expansion - `\unexpand\expandafter` add spaces : how to append a text at the end of a file - TeX - LaTeX Stack Exchange
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pstricks - How do I have to invoke \expandafter for a macro with multiple arguments? - TeX - LaTeX Stack Exchange
How does \expandafter work: From basic principles to exploring TeX's source code - Overleaf, Editor de LaTeX online
How does \expandafter work: A detailed study of consecutive \expandafter commands - Overleaf, Editor de LaTeX online
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