Potential answers for "Abbr. on some letter headings"

⭐⭐⭐⭐ ATTN
⭐⭐⭐ SIRS
⭐⭐ ENCL
⭐⭐ ENC
⭐⭐ INC
⭐⭐ PPS
⭐⭐ PSS
⭐⭐ EPH
⭐⭐ SASE

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