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Tree mining: Equivalence classes for candidate generation

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Figure

Fig. 2. Pivot P obtained by removing the left most leaf rml(T ) from T .
Fig. 4. Frequent trees of size 3.
Fig. 6. Candidate trees generated by the product operator applied on the class [P δ 1 ] and [P δ 2 ].
Fig. 7. Left pivot trees.
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