a b c c b a
a b c a b c c b a c b a
a b c a b c a b c a b c c b a c b a c b a c b a
a b c a b c a b c a b c a b c a b c a b c a b c c b a c b a c b a c b a c b a c b a c b a c b a
a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a
a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a
a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a
a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c a b c c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b a c b b