3 50
a b
e f
c d
cc ck
kj kc
jj cj
kc ck
kj jj
kc cc
kk kj
jc ck
kc jj
jc jk
kj jc
kc kj
cc kc
cj cc
cj jk
kj cc
jc cj
jj jj
ck cc
jc jj
ck jk
ck jc
jc kj
jc kc
jk kc
jj ck
kk jk
jk cj
jk kj
kk cc
cc kk
jj kj
jk ck
jk jj
ck kk
kj kk
kk jj
jj cc
ck kc
cj ck
kk kk
kk jc
kc cj
cc jc
kk cj
kj kj
cc jk
jj kk
ck kj
jc cc