Nothing
# These are the TeX catcodes
ESCAPE <- 0 # backslash
LBRACE <- 1 # {
RBRACE <- 2 # }
MATH <- 3 # $
ALIGN <- 4 # &
NEWLINE <- 5 # \n or \r
PARAM <- 6 # the # char
SUPER <- 7 # ^
SUB <- 8 # _
IGNORE <- 9 # nul
SPACE <- 10 # blank or tab
LETTER <- 11 # letters
OTHER <- 12 # everything else
ACTIVE <- 13 # "active" characters, only ~
COMMENT <- 14 # %
INVALID <- 15 # \x7F
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