OLL 52

http://www.speedsolving.com/wiki/images/0/00/O52.gif

OLL R' U' R U' R' d R' U R B [X]
OLL R U R' U R d' R U' R' F' [X]
OLL y2 R' U' x U R' U' R U R' U' R x' U R [X]
OLL (R U R' U R U2 R') U (F U R U' R' F')