Simplify as much as possible.

1. $(AB + C) (AB + C')=$
2. $X'W + XW' + XW + X'W'=$
3. $pqr + rp=$
4. $(y'+z')xyz=$
5. $(C+DX) (C+EX)=$
6. $T(L'+V) + TV'=$
7. $fg \oplus 1 =$
8. $(m \oplus n) \oplus (m' \oplus n)=$
9. $(uw \oplus (t+u))'$
10. $(xy+z)'(z(x'+y'))$
11. $[(x+a)(x+b)(x+c)(x+d)]'=$