.

tttt

ttttt

y

yy

yyy

yyyy

yyyyy

yyyyyy

u

uu

uuu

uuuuu

uuuu

uuuuuu

i

ii

iii

iiii

iiiiii

iiiiiii

o

oo

ooo

oooo

p

pp

ppp

pppp

ppppp

b

bb

bbb

bbbb

bbbbb

bbbbbb

n

nn

nnn

nnnnn

m