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

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

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Language Processors
Assembler is

is a program that appears to execute a source program as if it were machine language
a program that accepts a program written in a high level language and produces an object program
a program that places programs into memory and prepares them for execution
a program that automate the translation of assembly language into machine language

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