State whether a given pair of terms is of like terms or unlike terms:

 $12xz, 12x^2{z}^2$ 

Identify like terms in the following:

$-x{y}^2,-4y{x}^2,8x^2,2x{y}^2,7y,-11x^2,-100x,-11yx,20x^{2}y,-6x^2,y,2xy,3x$

Identify like terms in the following:

$10pq, 7p, 8q, -p^2{q}^2, -7qp, -100q, -23, 12q^2{p}^2, -5p^2, 41, 2405p,$ $78qp, 13p^{2}q, q{p}^2, 701p^2$.