Before revision:  (2) The efficient Hierarchical Temporal Pattern Graph Mining (HTPGM) algorithm that uses efficient data structures to enable fast computations for support and confidence . (3) A number of pruning techniques for HTPGM that yield significantly faster mining.
After revision:  (2) The efficient Hierarchical Temporal Pattern Graph Mining (HTPGM) algorithm that uses efficient data structures to enable fast computations for support and confidence , and employs effective pruning techniques to achieve significantly faster mining.