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18 (A (c (b (e, d), d (e, b), e (b, d)), d (b (c, e), c (e, b), e (c, b)),…
18
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c
b
e
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d
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b
e
b
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d
b
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e
c
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e
c
b
b
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c
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b
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c
a
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c
a
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a
c
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e
b
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a
d
c
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a
a
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a
e
c
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d
c
b
e
b
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d
b
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a
e
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a
a
c
e
b