A is for Alexander. Platonian midget.
B is for the Beltane star system, a major shipping and transport region.
C is for Canada, where Riker wasn't from.
D is for Dimoran rodent things.
E is for Erectile dysfunction, which Riker never suffered from.
F is for Federation Diplomats. The best diplomat I know is a fully charged phaser bank.
G is for Glommer. Tribble predator.
H is for Hirogen hunting trophies.
I is for Iconians. Demons of air and darkness.
J is for Jupiter Station.
K is for Kelvans. Immensely powerful aliens from another galaxy. That apparently can be overcome by whiskey and some pep pills.
L is for Lurians. Some of them could be very, very quiet.
M is for Morn, who didn't have any lines.
N is for Natira's exotic Fabrini eyeshadow.
O is for Organian Peace Treaty.