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Level 50 - ENTIRHI
The answer to this puzzle is:
Words: HINTER, TINIER, THEIN, INERT, ITHER, TRINE, NITER, NITRE, THINE, HENT, TERN, TINE, TIRE, RITE, NITE, INTI, HERN, THE, HER, NIT, IRE, HIE, NTH
Bonus words:
HINTER, TINIER, THEIN, INERT, ITHER, TRINE, NITER, NITRE, THINE, HENT, TERN, TINE, TIRE, RITE, NITE, INTI, HERN, THE, HER, NIT, IRE, HIE, NTH