42.1.115. 元 (yuan2, first)
Mnemonic: my first son (儿 (er2, son)) had two (二 (er4, two)) legs, but the second one had three!
Mnemonic: my first son (儿 (er2, son)) had two (二 (er4, two)) legs, but the second one had three!
Mnemonic: my first son (儿 (er2, son)) had two (二 (er4, two)) legs, but the second one had three!