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Although ㄭ is a rhyme, it never appears without an initial consonant (which is either ㄓ, ㄔ, ㄕ, ㄖ, ㄗ, ㄘ, or ㄙ) and therefore it can only appear at the end of the character's phonetic transcription.
Overall, ㄭ is rarely used and is usually omitted. [1]