[tex-eplain] Re: [texhax] Subsubentries with eplain and makeindex

[Karl Berry]

    BTW, I wonder why eplain needed to have special
    syntax for the first subentry.  The ! mechanism is
    fully general...

As I recall, my thought was to avoid hardwiring the ! character, in case
some document wanted to use something else.  My feeling was the number
of indexes with subsubentries is miniscule (and seems like the index
must be very complex indeed to warrant using it).