Core modules (U)
  
    
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- Unicode::Collate - Unicode Collation Algorithm
- Unicode::Collate::CJK::Big5 - weighting CJK Unified Ideographs for Unicode::Collate
- Unicode::Collate::CJK::GB2312 - weighting CJK Unified Ideographs for Unicode::Collate
- Unicode::Collate::CJK::JISX0208 - weighting JIS KANJI for Unicode::Collate
- Unicode::Collate::CJK::Korean - weighting CJK Unified Ideographs for Unicode::Collate
- Unicode::Collate::CJK::Pinyin - weighting CJK Unified Ideographs for Unicode::Collate
- Unicode::Collate::CJK::Stroke - weighting CJK Unified Ideographs for Unicode::Collate
- Unicode::Collate::CJK::Zhuyin - weighting CJK Unified Ideographs for Unicode::Collate
- Unicode::Collate::Locale - Linguistic tailoring for DUCET via Unicode::Collate
- Unicode::Normalize - Unicode Normalization Forms
- Unicode::UCD - Unicode character database
- UNIVERSAL - base class for ALL classes (blessed references)
- User::grent - by-name interface to Perl's built-in getgr*() functions
- User::pwent - by-name interface to Perl's built-in getpw*() functions