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Level 13 - HEORINE
The answer to this puzzle is:
Words: HEREIN, HEROIN, HEREON, INHERE, HONER, IRONE, HIREE, HERN, ERNE, NORI, HOER, HORN, NOIR, INRO, ROE, RHO, IRE, HER, NOR, ERE, HON, EON, HOE, NEE, HIE
Bonus words:
HEREIN, HEROIN, HEREON, INHERE, HONER, IRONE, HIREE, HERN, ERNE, NORI, HOER, HORN, NOIR, INRO, ROE, RHO, IRE, HER, NOR, ERE, HON, EON, HOE, NEE, HIE