:quit 
:q
aaaaa



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v bbb type:quit quit type:quit :wqJJJJJJJJJJJJJJ

creating a new branch si quick.
I made a mistake,previous branch dev is not associte master,it wrong !
The the master1 is right,it comes from master a branch,so it only can merge 
with master !
I create a new branch_file dev1