655. What characters can be added here so that each character contains a part of the previous character? 劣 -> _ -> _ -> 地

Answer:

劣 -> 加 -> 吐 -> 地

劣  RETSU, oto(ru) - be inferior

加  KA, kuwa(eru), kuwa(waru) - add, append, join, take part

吐  TOU, ha(ku) - spew, vomit, give vent to

地  CHI, JI - earth, land