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Question - Tremor Frame data on Db1 cancels?

Iv'e recently picked up Tremor, however i can't find any information on how plus cancelling into db1 is off of the main strings. I see them used all the time in vods, so i'd like to know the advantage on the cancels i'm doing. If anyone knows them off the top of their head, or has a link to it, that'd be greatly appreciated.

The main strings i'm curious about are

F121 db1
B1d4u4 db1
B1du4 db1
21d4u4 db1
21 db1

Cheers