s
i
t
e
s
5
t
'
/
t
0
.
5
s
h
o
w
1
D
(
d
i
m
e
r
c
h
a
i
n
)
2
D
(
c
o
u
p
l
e
d
d
i
m
e
r
c
h
a
i
n
s
)