This is makeindex, version 2.17 [TeX Live 2024] (kpathsea + Thai support).
Scanning input file abcl.idx....done (675 entries accepted, 0 rejected).
Sorting entries........done (7132 comparisons).
Generating output file abcl.ind....done (724 lines written, 0 warnings).
Output written in abcl.ind.
Transcript written in abcl.ilg.
