Language Processors
The advantage(s) of incorporating the macro processor into pass 1 is/ are:

more flexibility is available to the programmer in which he/she may use all the features of the assembler in conjunction with macros
Functions are combined and it is not necessary to create intermediate files as output from the macro processor and input to the assembler
many functions do not have to be implemented twice
All of these

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Language Processors
In analyzing the compilation of PL/I program, the term "Lexical analysis" is associated with

creation of more optional matrix
recognition of basic syntactic constructs through reductions
use of macro processor to produce more optimal assembly code
recognition of basic elements and creation of uniform symbols

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