rr

ee

ss

pp

oo

nn

r

r+e

r+e+s

r+e+s+p

r+e+s+p+o

r+e+s+p+o+n

= respon

r

e

s

p

o

n

r

e

s

o

p

n

r

e

s

p

o

n

rr

ee

ss

bb

aa

cc

kk

respon respon respon respon respon respon respon respon respon

resback