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Level 21 - HTENERI
The answer to this puzzle is:
Words: THEREIN, NETHER, RETINE, THEINE, HEREIN, TRIENE, INHERE, HINTER, NITER, THINE, TREEN, RENTE, NITRE, THEIN, TRINE, HIREE, INERT, ITHER, RETIE, ETHER, TERNE, HINT, TINE, THEE, ERNE, RENT, TERN, TEEN, RETE, NITE, HERE, THEN, REIN, HERN, TIER, HENT, RITE, TIN, ERE, HIT, NEE, THE, TEE, NTH, NIT, IRE, HIE, HER, HEN
Bonus words:
THEREIN, NETHER, RETINE, THEINE, HEREIN, TRIENE, INHERE, HINTER, NITER, THINE, TREEN, RENTE, NITRE, THEIN, TRINE, HIREE, INERT, ITHER, RETIE, ETHER, TERNE, HINT, TINE, THEE, ERNE, RENT, TERN, TEEN, RETE, NITE, HERE, THEN, REIN, HERN, TIER, HENT, RITE, TIN, ERE, HIT, NEE, THE, TEE, NTH, NIT, IRE, HIE, HER, HEN