Potential answers for "Once-in-a-blue-moon events"

⭐⭐⭐⭐ RARITIES
⭐⭐⭐ SELDOMLY
⭐⭐⭐ RARE
⭐⭐⭐ INA
⭐⭐⭐ SELDOM
⭐⭐⭐ RARELY
⭐⭐⭐ VERYSELDOM

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