  NUUUUUUU
22U
222-
K K2-
N   K 2-
NUUUUUh

2h
UU  K -
N   K K2-
N   K 2-
NUUUUUh

2h
UU  K K2-
N   K2-
N   K K NUUUU
22-
N
KFIK
I