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Level 18 - NERTEIGN
The answer to this puzzle is:
Words: RINGENT, TREEING, INTERNE, RENNET, TINNER, TEEING, TENNER, REGENT, GINNER, TRIENE, ENGIRT, GERENT, RETINE, INTER, GENRE, RENIN, RETIE, TRINE, NITER, RENIG, TENGE, TIGER, TERNE, NITRE, RENTE, TREEN, REIGN, GENET, GREE, TRIG, NENE, NITE, EGER, TERN, GIEN, GIRT, GITE, RETE, GIRN, GRIT, TEEN, TIRE, RING, GRIN, REIN, ERNE, TREE, RENT, TIER, NINE, GENE, RITE, GENT, TINE, TING, NET, TIE, TIN, GET, GIN, GIT, NIT, IRE, ERG, TEN, ERE, REG, RIG, NEE, TEE, GEE, ENG, GEN, INN
Bonus words:
RINGENT, TREEING, INTERNE, RENNET, TINNER, TEEING, TENNER, REGENT, GINNER, TRIENE, ENGIRT, GERENT, RETINE, INTER, GENRE, RENIN, RETIE, TRINE, NITER, RENIG, TENGE, TIGER, TERNE, NITRE, RENTE, TREEN, REIGN, GENET, GREE, TRIG, NENE, NITE, EGER, TERN, GIEN, GIRT, GITE, RETE, GIRN, GRIT, TEEN, TIRE, RING, GRIN, REIN, ERNE, TREE, RENT, TIER, NINE, GENE, RITE, GENT, TINE, TING, NET, TIE, TIN, GET, GIN, GIT, NIT, IRE, ERG, TEN, ERE, REG, RIG, NEE, TEE, GEE, ENG, GEN, INN