Swap UF/UL (29*):
U2 (rL2) U (rL2) U (rL2) U (rL2)2 U' (rL2) U (rL2) U2 (rL2)2 U2 (rL2)2 U2 (rL2) U' (rL2)' U (rL2)2 U' (rL2)' U' (rL2)' U' (rL2)' U2

Flip UL + swap LF/LB: at least 43