Potential answers for "Letters that further extend letters"

⭐⭐⭐⭐ PPS
⭐⭐⭐ SRO
⭐⭐⭐ ONE
⭐⭐⭐ SWAK
⭐⭐⭐ PSIS
⭐⭐⭐ ETAS
⭐⭐⭐ USA
⭐⭐⭐ DTS

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