  NUUUUUUU
22  
UUU
222-
N   K K NUUUU
22-
NU
2UUUUUU
222-
N   K K2-
N   K 2-
NUUUUUh

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