Find the common factors of the given terms. (i) `12x,36` (ii) `2y,22xy` (iii) `14pq, 28p^2q^2` (iv) `2x,3x^2,4` (v) `6abc, 24ab^2, 12a^2b` (vi) `16x^3,-4x^2,32x` (vii) `10pq, 20qr, 30rp` (viii) `3x^2 y^3, 10x^3y^2, 6x^2y^2z`