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Level 2 - NAIIODDT
The answer to this puzzle is:
Words: IODIN, TONDI, OIDIA, DANIO, NITID, IODID, TAIN, DADO, DITA, DIDO, DONA, INTI, INIA, DOIT, ADIT, DOAT, DINT, IOTA, DATO, NOTA, INTO, AID, TON, DON, ADD, DIN, ANT, DIT, NIT, ANI, TAD, ADO, DAD, ION
Bonus words:
IODIN, TONDI, OIDIA, DANIO, NITID, IODID, TAIN, DADO, DITA, DIDO, DONA, INTI, INIA, DOIT, ADIT, DOAT, DINT, IOTA, DATO, NOTA, INTO, AID, TON, DON, ADD, DIN, ANT, DIT, NIT, ANI, TAD, ADO, DAD, ION