preamble
"\\begin{theindex}
\\renewcommand\\item{\\bigskip\\par\\normalfont\\bfseries}
\\renewcommand\\subitem{\\medskip\\par\\normalfont\\itshape}
\\newcommand\\firstsubitem{\\medskip\\par\\nobreak\\hangindent 1in\\normalfont\\itshape}
\\renewcommand\\subsubitem{\\par\\hangindent 1in\\normalfont\\hspace*{0.25in}}
\\newcommand\\firstsubsubitem{\\par\\nobreak\\hangindent 1in\\normalfont\\hspace*{0.25in}}\n"

item_01
"\n    \\firstsubitem"

item_x1
"\n    \\firstsubitem"

item_2
"\n      \\subsubitem\\raggedright\\strut\\rlap{"

item_12
"\n      \\firstsubsubitem\\raggedright\\strut\\rlap{"

item_x2
"\n      \\firstsubsubitem\\raggedright\\strut\\rlap{"

delim_0 "\\normalfont , "
delim_1 "\\normalfont , "
delim_2 "}\\normalfont\\hspace*{0.75in}%"