xyr x y r x y r u u
y a b u a b a b c d e f g u a b c d e g u u e e f yx
a b a b a b c a b c a b a b c a b a b c a b c a b c
a u xy
a b u a b c d a b c d u ar ar
a xy u a b c a b c a b p
a b a b c a b c d a b x c x
x a b c a b
a b a b c
a b a b u a b
a b c d a b c d e f a b a
a b c d a b a b a b c a b c d a b a b u u u u
u u u u