c a t e n a qi kan zhi hu
c a r b o n qi kan zhi hu
c c f qi kan zhi hu
c h e m qi kan zhi hu
c e l l qi kan zhi hu
e i qi kan zhi hu
e n g i n e e r i n g qi kan zhi hu
e s i qi kan zhi hu
e n e r g i e s qi kan zhi hu
g c b qi kan zhi hu
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