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This document discusses variable scoping rules in the Erlang programming language. It begins with an introduction to Erlang and refactoring. It then explains that in Erlang, variables are local to function clauses and cannot change value within a function call. The document defines variable scope as the part of the program affected by the variable. It presents examples of refactoring techniques like renaming variables, merging duplicated expressions, and extracting functions. It discusses conditions for the
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