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next unless ($Var=~/^_[A-Z][A-Z_128]+$/);

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_SC_2_C_BIN             _POSIX2_C_BIND     
_SC_2_C_DEV             _POSIX2_C_DEV      
...
_SC_2_UPE               _POSIX2_UPE        
_SC_2_VERSION           _POSIX2_VERSION    
_SC_XOPEN_ENH_I18N      _XOPEN_ENH_I18N