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Level 21 - HNRTEEIN
The answer to this puzzle is:
Words: INTERNE, HEREIN, RENNET, THEINE, RETINE, HINTER, INHERE, TINNER, TENNER, TRIENE, NETHER, TREEN, ITHER, HIREE, RENTE, THEIN, TRINE, THINE, RENIN, TERNE, NITRE, ENTER, RETIE, NITER, THIN, TERN, NINE, RETE, HERE, NENE, HEIR, TREE, NITE, THEN, HERN, HIRE, TEEN, ERNE, TINE, RENT, THEE, REIN, RITE, HINT, TIER, TIRE, HENT, TEN, HIE, NTH, NEE, THE, NIT, IRE, TEE, INN, HER, HIT, NET, HEN, TIN, TIE, ERE
Bonus words:
INTERNE, HEREIN, RENNET, THEINE, RETINE, HINTER, INHERE, TINNER, TENNER, TRIENE, NETHER, TREEN, ITHER, HIREE, RENTE, THEIN, TRINE, THINE, RENIN, TERNE, NITRE, ENTER, RETIE, NITER, THIN, TERN, NINE, RETE, HERE, NENE, HEIR, TREE, NITE, THEN, HERN, HIRE, TEEN, ERNE, TINE, RENT, THEE, REIN, RITE, HINT, TIER, TIRE, HENT, TEN, HIE, NTH, NEE, THE, NIT, IRE, TEE, INN, HER, HIT, NET, HEN, TIN, TIE, ERE