runtime/frame, exponential increasing

runtime/stn ratio slightly increase

.163, apriori, runtime/stn testing

.110, apriori, runtime/number of frame

.111 apriori, runtime/support

the expected runtime is about 3000 secs

Apriori should log the level of mining when receive ctrl+C

The key issue: dont know how to inspect the patterns we found. Selection strategy should be designed