Determining the validity of arguments

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Across
  1. 3. in evaluating complex statements with the aid of ______ will help us clarify ambiguities
  2. 5. the first step in determining the validity of argument
  3. 6. some interpretations is true and others are false
  4. 8. without parenthesis in the statement (TvD).K translation may become ______
  5. 10. rows needed if there are 3 variables are unknown
Down
  1. 1. the falsity or truth of argument
  2. 2. we use 2 rows if there are/is ____ unknown variable/s
  3. 4. it is also called as "Mathematical logic"
  4. 7. we use 4 rows if there are/is ____ unknown variable/s
  5. 9. rows needed if there are 4 variables are unknown