First, the first sentence doesn't rhyme:
⊙шшшш, (rhymes)
Flat and light. (rhymes)
⊙ Ping,
⊙??is apartment. (rhymes)
Second, the first sentence of the five-element poem does not rhyme:
Pingping,
Flat and light. (rhymes)
⊙ Ping,
⊙??is apartment. (rhymes)
Three and five are absolutely equal. The first sentence rhymes:
Flat and even, (rhymes)
⊙??is apartment. (rhymes)
Pingping,
Flat and light. (rhymes)
Fourth, five are absolutely equal. The first sentence does not rhyme:
⊙ Ping,
⊙??is apartment. (rhymes)
Pingping,
Flat and light. (rhymes)
~~~~~
The circle represents the middle, which can be even or even.