Potential answers for "Certain Greek letters"

⭐⭐⭐⭐ NUS
⭐⭐⭐⭐ ETAS
⭐⭐⭐⭐ RHOS
⭐⭐⭐⭐ PHIS
⭐⭐⭐⭐ PSIS
⭐⭐⭐⭐ CHIS

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