C, considerate words (Xiao Zhuan, like a horn, from "North". From the "north", take the meaning of cracking the back. Original meaning: deviation, violation, disharmony)
D, crystal-knowing word (Oracle Bone Inscriptions glyph, from three days, indicating the meaning of light. Original meaning: bright, bright)
Only a is a full-tone character.
Bang (external sound) summer (left shape and right sound) in (upper shape and lower sound) body (left shape and right sound)