Add changes to main
$ vim MAIN
$ git add .
$ git commit -m m1
[main 8f78730] m1
1 file changed, 1 insertion(+)
create mode 100644 MASTER
$ vim MAIN
$ git add .
$ git commit -m m2
[main 591a601] m2
1 file changed, 1 insertion(+)
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$ vim MAIN
$ git add .
$ git commit -m m1
[main 8f78730] m1
1 file changed, 1 insertion(+)
create mode 100644 MASTER
$ vim MAIN
$ git add .
$ git commit -m m2
[main 591a601] m2
1 file changed, 1 insertion(+)