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Level 21 - EITHNGFR
The answer to this puzzle is:
Words: REFIGHT, HEFTING, ENGIRT, FRINGE, NIGHER, FETING, HINGER, HINTER, FRIGHT, FIGHT, THEIR, NITRE, FRITH, ITHER, FINER, INFER, GRIFT, TINGE, GRIEF, THEIN, THINE, REFIT, NEIGH, TRINE, FEIGN, FEINT, NITER, NIGHT, NIGER, THEGN, RENIG, GRITH, HIRE, RIFT, RIFE, HERN, TERN, TRIG, HEFT, NITE, GRIT, RING, FIRE, GITE, NIGH, THEN, GIFT, HEIR, FERN, FRET, FRIG, TIER, TINE, THIN, HINT, RITE, TING, REIN, GRIN, FIRN, HENT, TIRE, GIEN, FINE, GIRT, GIRN, RENT, FRIT, GENT, THE, TIE, TIN, GET, HEN, HIE, GEN, NET, FIT, HIT, HER, FIG, REF, GIN, GIT, ENG, RIG, FIE, FIN, FIR, REG, IRE, TEN, NIT, FER, NTH, ERG, FEN
Bonus words:
REFIGHT, HEFTING, ENGIRT, FRINGE, NIGHER, FETING, HINGER, HINTER, FRIGHT, FIGHT, THEIR, NITRE, FRITH, ITHER, FINER, INFER, GRIFT, TINGE, GRIEF, THEIN, THINE, REFIT, NEIGH, TRINE, FEIGN, FEINT, NITER, NIGHT, NIGER, THEGN, RENIG, GRITH, HIRE, RIFT, RIFE, HERN, TERN, TRIG, HEFT, NITE, GRIT, RING, FIRE, GITE, NIGH, THEN, GIFT, HEIR, FERN, FRET, FRIG, TIER, TINE, THIN, HINT, RITE, TING, REIN, GRIN, FIRN, HENT, TIRE, GIEN, FINE, GIRT, GIRN, RENT, FRIT, GENT, THE, TIE, TIN, GET, HEN, HIE, GEN, NET, FIT, HIT, HER, FIG, REF, GIN, GIT, ENG, RIG, FIE, FIN, FIR, REG, IRE, TEN, NIT, FER, NTH, ERG, FEN