All the allomorphs should be in complementary distribution.
举一反三
- 中国大学MOOC: Pair is not in complementary distribution.
- The allophones are either phonetically similar or in complementary distribution.
- 4. Sounds in complementary distribution must be allophones.
- State clearly the term ‘complementary distribution’ in phonemics. （暨南大学）
- The speech sounds which are in complementary distribution are definitely allophones of the same phoneme.