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N
u
m
b
e
r
(
a
d
d
/
s
u
b
)
S
i
n
g
l
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d
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d
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c
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A
d
d
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n
f
a
c
t
f
a
m
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l
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s
(
a
+
b
=
c
,
c
-
b
=
a
)
F
a
c
t
F
a
m
i
l
i
e
s
(
I
n
v
e
s
t
i
g
a
t
i
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n
)
R
e
p
r
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s
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n
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a
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f
a
d
d
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s
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b
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b
j
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c
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S
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B
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1
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s
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S
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C
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(
s
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a
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)
S
t
r
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g
y
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N
u
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(
s
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d
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w
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d
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)
U
s
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g
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1
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1
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u
p
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2
0
A
d
d
m
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m
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w
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2
0
A
d
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3
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5
0
Lesson
Practice
A
d
d
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s
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g
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l
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m
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p
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5
0
I
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d
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3
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A
d
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3
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(
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