BCDGJKPQTVWYZ are the letters whose English names do not begin with a vowel (but do end in a vowel).
FHLMNRSX are the letters whose English names begin with a vowel but end in a consonant. The remaining groups of letters are arranged by how they rhyme:
BCEGKMQSW are letters in prime position, DFHIJLNOPRTUVXYZ are composites.
BDO have no "spokes", P has 1, ACGLMNQRSUVWZ have 2, EFJTY have 3, and HIKX have 4.
CEFGHIJKLMNSTUVWXYZ have no loops, ADOPQR have one loop, and B has two loops.
BEJQXYZ begin no state names;
DFGHLPRU begin 1 state name each:
Delaware, Florida, Georgia, Hawaii, Louisiana, Pennsylvania, Rhode Island and Utah.
KSTV begin 2 state names each:
Kansas, Kentucky; South Carolina, South Dakota; Tennessee, Texas; Vermont, Virginia.
CO begin 3 state names each:
California, Colorado, Connecticut; Ohio, Oklahoma, Oregon.
AIW begin 4 state names each:
Alabama, Alaska, Arizona and Arkansas; Idaho, Illinois, Indiana, Iowa;
Washington, West Virginia, Wisconsin, Wyoming.
MN begin 8 state names each:
Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana;
Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota.
ABEHIKMNOPTXZ look like Greek letters, while
CDFGJLQRSUVWY do not look like Greek letters.
AEFHIKLMNTVWXYZ have no curves; Of non-curved letters, EFHILT have no slanted
lines, while AKMNVWXYZ have slanted lines.
BCDGJOPQRSU have curves; Of curved letters, CGJSU have no loops while BDOPQR have loops.