Potential answers for "Difficult chem class"

⭐⭐⭐⭐ ORGO
⭐⭐⭐ NACL
⭐⭐⭐ ATNOS
⭐⭐⭐ LAB
⭐⭐⭐ LABFEE
⭐⭐⭐ ATWT
⭐⭐⭐ PHS
⭐⭐⭐ ELEMS

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