Potential answers for "Inviolable, as a rule"

⭐⭐⭐⭐ HARDANDFAST
⭐⭐ STYX
⭐⭐ SANCTA
⭐⭐ HAREM
⭐⭐ SACROSANCT
⭐⭐ SACRED
⭐ CANON
⭐ JCPENNEY
⭐ MAYBE

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