Is the following argument form valid or invalid?

$p^{{?}^{?}}qr$

$pvvq$

$qp$

:$.r$

To find the answer, first enter the missing values in the truth table below.

$\backslash$table$[[,,,,,,,,],[$p$,q,r,q,r,p^{{?}^{?}}q,p^{{?}^{?}}qr,pvvq,qp$