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Level 12 - ULTEVIR
The answer to this puzzle is:
Words: RUTILE, UTERI, VIRTU, UTILE, LITRE, LIVRE, TILER, ERVIL, VILER, VERTU, RELIT, RIVE, RILE, VIER, LIER, LUTE, RIEL, LITU, LITE, ETUI, LIEU, VERT, VILE, LIRE, RUT, LIT, VIE, TIL, LIE, LET, TEL, VET, LUV, TIE, IRE, REV, RUE, LEI
Bonus words:
RUTILE, UTERI, VIRTU, UTILE, LITRE, LIVRE, TILER, ERVIL, VILER, VERTU, RELIT, RIVE, RILE, VIER, LIER, LUTE, RIEL, LITU, LITE, ETUI, LIEU, VERT, VILE, LIRE, RUT, LIT, VIE, TIL, LIE, LET, TEL, VET, LUV, TIE, IRE, REV, RUE, LEI