Potential answers for "Narrow opening for letters"

⭐⭐⭐⭐ MAILSLOT
⭐⭐⭐ FISSURE
⭐⭐⭐ CRANNY
⭐⭐⭐ SLIT
⭐⭐⭐ GAP
⭐⭐⭐ SLOT
⭐⭐⭐ CREVICE
⭐⭐ LOUVER
⭐⭐ FYI

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