(B) (C) (D) (E) (F) (G) (H) (I) (J) (K) (L) (M) (N) (O) (P) (R) (S) (T) (U) (V) (WXYZ)

A

B

C

D

E

F

G

H

Headway - (p1,headway)

Hole - (p2,hole)

J

K

L

M

N

O

P

R

S

T

U

UNSPEC - Key to see structure of other keys (p2,unspec)

USERF - a factory for user environments (p2,userf)

W=X=Y=Z