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Level 21 - IMPESL , GNNTREI
The answer to this puzzle is:
Words: RINGENT, ENGIRT, GINNER, TINNER, TINGE, RENIG, NITER, NITRE, RENIN, TRINE, INERT, INNER, TIER, GRIT, GIRN, GIEN, GIRT, GITE, RENT, TIRE, NITE, RITE, TERN, TRIG, GRIN, TING, NINE, GENT, TINE, REIN, TIE, GIT, TIN, GET, GIN, NET, NIT, ENG, GEN, REG, ERG, IRE, INN, TEN
Bonus words:
RINGENT, ENGIRT, GINNER, TINNER, TINGE, RENIG, NITER, NITRE, RENIN, TRINE, INERT, INNER, TIER, GRIT, GIRN, GIEN, GIRT, GITE, RENT, TIRE, NITE, RITE, TERN, TRIG, GRIN, TING, NINE, GENT, TINE, REIN, TIE, GIT, TIN, GET, GIN, NET, NIT, ENG, GEN, REG, ERG, IRE, INN, TEN