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Tælletræ (a (a (b, c, a), b (b, c, a), c (b, c, a)), b (b (b, c, a), c (b,…
Tælletræ
a
a
b
c
a
b
b
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a
c
b
c
a
b
b
b
c
a
c
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c
a
a
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a
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a
a
b
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a