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Level 1 - IERGHAET
The answer to this puzzle is:
Words: ERGATE, HEGARI, ARIGHT, GAITER, HEATER, REHEAT, TRIAGE, AIGRET, AETHER, HEGIRA, HEREAT, ITHER, RETIE, TRAGI, RATHE, EATER, GRATE, GATER, ETHER, TARGE, TERGA, TERAI, HATER, ARETE, GIRTH, GARTH, AERIE, AIRTH, RETAG, GRITH, RETIA, GERAH, THERE, EAGER, EAGRE, EARTH, IRATE, EGRET, HIREE, RAGEE, GETA, RETE, GRAT, AGEE, TRIG, HATE, GITE, GHAT, EGER, GREE, HERE, TARE, RHEA, RATH, GHEE, RAGE, GATE, HARE, RITE, AIRT, GEAR, HAET, THAI, HIRE, TIER, RIGA, HEAT, RATE, HEAR, EATH, THEE, TREE, HAIR, GIRT, HEIR, HART, GAIT, GRIT, AGER, HAT, HIE, TAR, TEA, TIE, EAR, GET, ART, AGE, ERA, EAT, AIR, TAG, ARE, HIT, HER, TEE, HAG, ATE, GIT, GEE, RAG, RIG, ETA, REG, IRE, THE, GAR, RAH, GAT, ERG, ERE
Bonus words:
ERGATE, HEGARI, ARIGHT, GAITER, HEATER, REHEAT, TRIAGE, AIGRET, AETHER, HEGIRA, HEREAT, ITHER, RETIE, TRAGI, RATHE, EATER, GRATE, GATER, ETHER, TARGE, TERGA, TERAI, HATER, ARETE, GIRTH, GARTH, AERIE, AIRTH, RETAG, GRITH, RETIA, GERAH, THERE, EAGER, EAGRE, EARTH, IRATE, EGRET, HIREE, RAGEE, GETA, RETE, GRAT, AGEE, TRIG, HATE, GITE, GHAT, EGER, GREE, HERE, TARE, RHEA, RATH, GHEE, RAGE, GATE, HARE, RITE, AIRT, GEAR, HAET, THAI, HIRE, TIER, RIGA, HEAT, RATE, HEAR, EATH, THEE, TREE, HAIR, GIRT, HEIR, HART, GAIT, GRIT, AGER, HAT, HIE, TAR, TEA, TIE, EAR, GET, ART, AGE, ERA, EAT, AIR, TAG, ARE, HIT, HER, TEE, HAG, ATE, GIT, GEE, RAG, RIG, ETA, REG, IRE, THE, GAR, RAH, GAT, ERG, ERE