S
i
m
p
l
i
f
y
a
n
d
f
i
n
d
t
h
e
d
e
g
r
e
e
o
f
t
h
e
f
o
l
l
w
i
n
g
e
s
p
r
e
s
s
i
o
n
:
9
a
4
-
6
a
3
-
6
a
4
-
3
a
2
+
7
a
3
+
5
<
Matching exercise
Match the items on the right to the items on the left.
Check
OK
STEP1
STEP2
STEP3
STEP4
