Potential answers for "Letters that further extend letters"

⭐⭐⭐⭐ PPS
⭐⭐⭐ SWAK
⭐⭐⭐ ETAS
⭐⭐⭐ USA
⭐⭐⭐ SRO
⭐⭐⭐ ERN
⭐⭐⭐ EMAIL

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