Potential answers for "Letter holder: Abbr."

⭐⭐⭐⭐ ENV
⭐⭐⭐⭐ POB
⭐⭐ ENCL
⭐⭐ ENC
⭐⭐ ATTN
⭐⭐ INC
⭐⭐ PPS
⭐⭐ PSS
⭐⭐ EPH
⭐⭐ SSS

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