--- 
:transforms: 
  - 
    :direction: both
    :rules: 
      - "̄ <> 1;"
      - "́ <> 2;"
      - "̌ <> 3;"
      - "̀ <> 4;"
      - "< 5;"
    :source: Pinyin
    :target: NumericPinyin
    :variant: ~