16
17
18
19
20 >
a
b
c
c
d
d
e
e
f
f
x
y
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16 |
17 |
18 |
19 |
20 > |
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a |
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b |
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c |
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c |
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d |
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d |
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e |
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e |
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f |
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f |
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x |
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y |
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[PF80Pfg.]