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Level 16 - NATTIAOX
The answer to this puzzle is:
Words: ANTITAX, ANOXIA, ATONIA, ANATTO, TANTO, AXION, TAXON, TAIN, ANTA, ANOA, AXON, TOIT, TAXA, IOTA, TINT, INTO, NOTA, NIX, TOT, TIT, NIT, TAT, ANI, ATT
Bonus words:
ANTITAX, ANOXIA, ATONIA, ANATTO, TANTO, AXION, TAXON, TAIN, ANTA, ANOA, AXON, TOIT, TAXA, IOTA, TINT, INTO, NOTA, NIX, TOT, TIT, NIT, TAT, ANI, ATT