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A) skip building some COFI-trees: Before we build any COFI-tree, we check all its local frequent items, if all its items are subsets of already discovered maximal patterns, then there is no need to build and mine this COFI-tree as all its sub-patterns are subsets of already discovered maximal patterns.
B) Remove all frequent-path-bases that are subset of already found maximal patterns: Each frequent-path-base is checked first to see if it is part of an already existing maximal pattern.
All frequent frequent-path-bases are removed from the leap-traversal approach as they will only give subsets of frequent patterns and will not provide us with any new information in the context of searching for maximal patterns.