| grep -E "^[A-Z]{2,}'?s?$" \
> working/acronyms.lst.tmp
-cat l/not-abbreviations/* working/known-upper.lst \
+cat l/not-abbreviations/* \
| src/filter \
| src/add-affixes no-possessive \
| sort | uniq \
| sort | uniq \
| comm -23 - working/not-abbreviations.tmp \
| cat - working/acronyms.lst.tmp \
+ | cat - r/special/abbreviations{,-also} \
| sort | uniq \
| comm -23 - r/special/never-abbreviations \
> working/abbreviations.lst.pre