A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z
(also called "Triple Grades") means one F/N for each of three flows or three F/Ns per grade. There are not just three F/Ns per grade. There are dozens of F/Ns. (HCOB 30 Oct 71)
