195 letter series were omitted from 1977 to 1983,

including, but not limited to, these 88:

 

ABM, APE, ARS, ASS

BAD, BAG, BAR, BED, BEG, BET, BLA, BRA, BUB, BUD, BUM, BUN, BUT, BVD

CAD, CAN, CAT, CUR

DAM, DDL, DDT, DEW, DMV, DUD, DUM

END, EVE, EYE

FAG, FAN, FAT, FDC, FHP, FRY, FUG, FUN

GAG, GAT, GAY, GEE, GPU

HAD, HAG, HAM (Hire), HEL, HEX, HUG, HUT

JAP, JEW, JUG

KEG, KKK

LAF, LAP, LSD, LUG

MUT (Dealer)

NAG

PEA, PET, PEW, PSC, PUG, PUP, PUS

RAG, RAP, RAT, RAW, RED, RUM, RUT

SAD, SAP, SAT, SEX

URP

WAD, WAG, WED

XUJ

YEP, YES