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Level 18 - RBGIAAN
The answer to this puzzle is:
Words: BAAING, BARING, AGRIA, BAIRN, GRANA, GARNI, NAIRA, ANGA, AIRN, ABRI, RANI, BRIN, RAGA, AGIN, IRAN, RIGA, RANG, AGAR, GNAR, GIRN, GAIN, GARB, RING, BRIG, BRAN, BANI, BANG, ARIA, GRAN, BIG, BAN, AIR, NIB, RAN, RAG, NAG, NAB, GIN, GAR, GAB, ARB, ANI, BAG
Bonus words:
BAAING, BARING, AGRIA, BAIRN, GRANA, GARNI, NAIRA, ANGA, AIRN, ABRI, RANI, BRIN, RAGA, AGIN, IRAN, RIGA, RANG, AGAR, GNAR, GIRN, GAIN, GARB, RING, BRIG, BRAN, BANI, BANG, ARIA, GRAN, BIG, BAN, AIR, NIB, RAN, RAG, NAG, NAB, GIN, GAR, GAB, ARB, ANI, BAG