Potential answers for "Difficult chem class"

⭐⭐⭐⭐ ORGO
⭐⭐⭐ LABFEE
⭐⭐⭐ LAB
⭐⭐⭐ LABS
⭐⭐⭐ ATOM
⭐⭐⭐ ATWT
⭐⭐⭐ PHS

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