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Level 2 - TWETRTI
The answer to this puzzle is:
Words: TITTER, TITER, TETRI, TWIER, TITRE, TRITE, TWIT, WRIT, WERT, WEIR, TIT, IRE
Bonus words:
TITTER, TITER, TETRI, TWIER, TITRE, TRITE, TWIT, WRIT, WERT, WEIR, TIT, IRE