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Level 30 - IRTTEGL
The answer to this puzzle is:
Words: TILTER, REGILT, TETRI, TRITE, TITRE, TITER, LIGER, RELIT, LITRE, TILER, LIRE, LIER, GITE, TRIG, TILT, GELT, RILE, RITE, RIEL, LITE, GRIT, TIRE, GIRT, GILT, GET, GEL, ERG, TIL, TIT, TEL, REG, LEI, IRE, GIT, TIE
Bonus words:
TILTER, REGILT, TETRI, TRITE, TITRE, TITER, LIGER, RELIT, LITRE, TILER, LIRE, LIER, GITE, TRIG, TILT, GELT, RILE, RITE, RIEL, LITE, GRIT, TIRE, GIRT, GILT, GET, GEL, ERG, TIL, TIT, TEL, REG, LEI, IRE, GIT, TIE