Operating System (OS)
The advantage(s) of incorporating the macro processor into pass 1 is(are):

None of these
many functions do not have to be implemented twice.
Functions are combined and it is not necessary to create intermediate files as output from the macros processor and input to the assembler.
All of these
more flexibility is available to the programmer in that he may use all the features of the assembler in conjunction with macros.

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