Update file
$ vim README
$ git add .
$ git commit -m "second"
[main 398a810] second
1 file changed, 1 insertion(+)
$ vim README
$ git add .
$ git commit -m "third"
[main 33bb6a4] third
1 file changed, 1 insertion(+)
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$ vim README
$ git add .
$ git commit -m "second"
[main 398a810] second
1 file changed, 1 insertion(+)
$ vim README
$ git add .
$ git commit -m "third"
[main 33bb6a4] third
1 file changed, 1 insertion(+)