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Level 13 - RNCTEOC
The answer to this puzzle is:
Words: RECTO, CONTE, CENTO, NOTER, ONCET, TRONE, ROTE, TORN, CROC, CERO, TORC, COTE, TERN, TORE, TONE, ONCE, ROE, NOR, COT, ETC, ONE, NOT, EON, NET, CON, REC, TEN, ROT, TOR, COR, TON, TOE, ORE
Bonus words:
RECTO, CONTE, CENTO, NOTER, ONCET, TRONE, ROTE, TORN, CROC, CERO, TORC, COTE, TERN, TORE, TONE, ONCE, ROE, NOR, COT, ETC, ONE, NOT, EON, NET, CON, REC, TEN, ROT, TOR, COR, TON, TOE, ORE