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Level 2 - HRRETA
The answer to this puzzle is:
Words: RATHE, RATER, HATER, TARRE, REAR, RATH, TARE, RHEA, TEAR, HART, HAET, EATH, RAH, ATE, HER, TAR, THE, ETA, ERR, EAR, ARE
Bonus words:
RATHE, RATER, HATER, TARRE, REAR, RATH, TARE, RHEA, TEAR, HART, HAET, EATH, RAH, ATE, HER, TAR, THE, ETA, ERR, EAR, ARE