>> recognized 0
>> committing
stream : 00
last   :  ^
current:  ^
>> recognized 2
>> committing
stream : 10x
last   :  ^
current:  ^
>> recognized 12
>> committing
stream : 01100ab
last   :     ^
current:     ^
>> rejected
>> rolling back
stream : 101
last   :^
current:^
>> rejected
>> rolling back
stream : abc
last   :^
current:^
>> recognized 6
>> committing
stream : 110
last   :   ^
current:   ^