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1.5.2 Conforming Programs
  
Code conforming with the requirements of this standard shall adhere to the following: 
-   Conforming code shall use only those features of the language syntax and semantics that are either specified in this standard or defined using the extension mechanisms specified in the standard. 
 
-   Conforming code may use implementation-dependent features and values, but shall not rely upon any particular interpretation of these features and values other than those that are discovered by the execution of code. 
 
-   Conforming code shall not depend on the consequences of undefined or unspecified situations. 
 
-   Conforming code does not use any constructions that are prohibited by the standard. 
 
-   Conforming code does not depend on extensions included in an implementation. 
 
1.5.2.1 Use of Implementation-Defined Language Features
 
1.5.2.2 Character Set for Portable Code
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