1. How would you classify the following statement? $$x \vee \neg x$$ Contradiction
Contingence
Tautology
Does not parse
I don't know yet
What is your answer?

2. How would you classify the following statement? $$x \wedge \neg x$$ Contradiction
Contingence
Tautology
Does not parse
I don't know yet
What is your answer?

3. How would you classify the following statement? $$x \vee y$$ Contradiction
Contingence
Tautology
Does not parse
I don't know yet
What is your answer?

4. How would you classify the following statement? $$x \land y \lnot \lnot$$ Contradiction
Contingence
Tautology
Does not parse
I don't know yet
What is your answer?

5. How would you classify the following statement? $$\lnot \lnot z \lor a$$ Contradiction
Contingence
Tautology
Does not parse
I don't know yet
What is your answer?

6. How would you classify the following statement? $$x \lnot \land y$$ Contradiction
Contingence
Tautology
Does not parse
I don't know yet
What is your answer?

7. How would you classify the following statement? $$(x \wedge y) \land (z \wedge \neg y)$$ Contradiction
Contingence
Tautology
Does not parse
I don't know yet
What is your answer?

8. How would you classify the following statement? $$x \leftrightarrow (x \vee y)$$ Contradiction
Contingence
Tautology
Does not parse
I don't know yet
What is your answer?

9. How would you classify the following statement? $$(a \wedge b) \leftrightarrow (b \land a)$$ Contradiction
Contingence
Tautology
Does not parse
I don't know yet
What is your answer?

10. How would you classify the following statement? $$\left(z \wedge \left(z \rightarrow y\right)\right) \rightarrow \neg y$$ Contradiction
Contingence
Tautology
Does not parse
I don't know yet
What is your answer?