#1

BDELWZ

ACFGHIJKMNOPQRSTUVXY



#2

BDEFHIKLMNPRT

ACGJOQSUVWXYZ



#3

BMPW

ACDEFGHIJKLNOQRSTUVXYZ



#4

AEHKLMNQRWXZ

BCDFGIJOPSTUVY



#5

AKEIBDJMHFCLG

SQOWNTRYPXVUZ



#6

CFILORUX

ABDEGHJKMNPQSTVWYZ



#7

ABCDEGIPTVYZ

FHJKLMNOQRSUWX



#8

ABCDEFGHIJKLMNOPRSTUVWXY

QZ



#9 (extra tough)

ADFGHJKLS

BCEIMNOPQRTUVWXYZ



answers:

#1 All have angles at the bottom, along the bottom line.

#2 All contain at least one straight vertical line

#3 You must close your mouth to make the sound

#4 The letters won't fall over in a 2-d world.  They have at least 2 points touching the ground. serif don't count. Q decends!

#5 First half of alphabet, second half.

#6 Their position is divisible by three.  You can easily imagine hundreds of different mathematical possibilities, prime, Fibbonocci, pi, etc...

#7 All end with an 'ee' sound

#8 The letters used on a telephone.

#9 All letters on the middle row of a QWERTY keyboard.