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Level 23 - HTRENII
The answer to this puzzle is:
Words: TINIER, HINTER, THINE, INERT, THEIN, ITHER, TRINE, NITER, NITRE, HENT, THIN, TINE, TERN, RITE, REIN, NITE, INTI, HERN, HIRE, HER, THE, NTH, NIT, IRE, HIE, HIT, HEN, TIE, NET
Bonus words:
TINIER, HINTER, THINE, INERT, THEIN, ITHER, TRINE, NITER, NITRE, HENT, THIN, TINE, TERN, RITE, REIN, NITE, INTI, HERN, HIRE, HER, THE, NTH, NIT, IRE, HIE, HIT, HEN, TIE, NET