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branch label question "1f", "2f".. ?


Hi all:
    in the assembly code sometime we can see the jump would be like this:

	branch 1f
....
....

1:  	move xxx
	sub  xxx

	branch 2f
...
...
...
2: 	add xxx
	move xxx



why the label is not the same as appeared in the "branch" instruction?
Thanks


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