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N
u
m
b
e
r
(
a
d
d
/
s
u
b
)
S
i
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g
l
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d
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A
d
d
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f
a
c
t
f
a
m
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l
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(
a
+
b
=
c
,
c
-
b
=
a
)
R
e
p
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s
e
n
t
a
t
i
o
n
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f
a
d
d
/
s
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b
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s
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g
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b
j
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c
t
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S
t
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a
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g
y
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B
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1
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s
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a
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d
d
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b
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d
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S
t
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a
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g
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C
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p
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s
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(
s
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S
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N
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L
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s
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a
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d
d
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d
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U
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d
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s
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c
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W
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S
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c
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s
f
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d
d
/
s
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b
Lesson
Practice
U
s
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5
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