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Level 20 - RTOXRIEE
The answer to this puzzle is:
Words: RETORE, RIOTER, OXTER, EXERT, RETIE, TRIER, ROTE, TORI, TORR, ROTI, TIRO, RETE, TORE, TRIO, ERE, TOR, ROE, ERR, IRE
Bonus words:
RETORE, RIOTER, OXTER, EXERT, RETIE, TRIER, ROTE, TORI, TORR, ROTI, TIRO, RETE, TORE, TRIO, ERE, TOR, ROE, ERR, IRE