--- 
:transforms: 
  - 
    :direction: both
    :rules: 
      - "::NFD (NFC);"
      - "$tone = [̄́̌̀̆] ;"
      - "e {($tone) r} > r &Pinyin-NumericPinyin($1);"
      - "($tone) ( [i o n u {o n} {n g}]) > $2 &Pinyin-NumericPinyin($1);"
      - "($tone) > &Pinyin-NumericPinyin($1);"
      - "$vowel = [aAeEiIoOuU {ü} {Ü} vV];"
      - "$consonant = [[a-z A-Z] - [$vowel]];"
      - "$digit = [1-5];"
      - "$1 &NumericPinyin-Pinyin($3) $2 < ([aAeE]) ($vowel* $consonant*) ($digit);"
      - "$1 &NumericPinyin-Pinyin($3) $2 < ([oO]) ([$vowel-[aeAE]]* $consonant*) ($digit);"
      - "$1 &NumericPinyin-Pinyin($3) $2 < ($vowel) ($consonant*) ($digit);"
      - "&NumericPinyin-Pinyin($1) < [:letter:] {($digit)};"
      - "::NFC (NFD);"
    :source: Latin
    :target: NumericPinyin
    :variant: ~