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

many functions do not have to be implemented twice.
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.
None of these
Functions are combined and it is not necessary to create intermediate files as output from the macros processor and input to the assembler.

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Operating System (OS)
Assembler language

is quite different from the SCL interpreter
requires fixed-format commands
is a mnemonic form of machine language
is usually the primary user interface
None of these

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