# NOT RUN {
parse_tex(c("A{}", "B[a]{b{c}{d}}z"))
# The version transposed:
#
#> char : A{}B[a]{b{c}{d}}z
#> tg1 : 011111122......22
#> tg2 : 00000000011122222
#> og1 : 00001111111111111
#> GROUP_ID1 : .11....222222222.
#> GROUP_ID2 : .........111222..
#> OPT_GROUP_ID1 : ....111..........
# }
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