Write the negation of the following statement:
$q:$ All cats scratch.

The statement $p$ $\rightarrow (q$ $\rightarrow p)$ is equivalent to

$\sim (p \vee q) \vee (\sim p \wedge q)$ is logically equivalent to

If statements $p$ and $q$ are true and $r$ and $s$ are false,then the truth values of $\sim(p \rightarrow q) \leftrightarrow (p \wedge s)$ and $(\sim p \rightarrow q) \wedge (r \leftrightarrow s)$ are respectively:

If $p$: It is raining and $q$: It is pleasant,then the symbolic form of "It is neither raining nor pleasant" is

Negation of the statement "The payment will be made if and only if the work is finished in time." is