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Level 19 - STKACTA
The answer to this puzzle is:
Words: TACKS, KATAS, TACTS, TAKAS, SCATT, TAKA, KATA, TATS, TACT, KATS, ACTA, STAT, ACTS, CATS, TACK, CASA, TAT, SAT, SKA, ATT, SAC, CAT
Bonus words:
TACKS, KATAS, TACTS, TAKAS, SCATT, TAKA, KATA, TATS, TACT, KATS, ACTA, STAT, ACTS, CATS, TACK, CASA, TAT, SAT, SKA, ATT, SAC, CAT