U' F' B R'    // EO on LR-axis (4/4)
B2 D' L2 U' F // 2x2x2 on UFL + Slice on S (5/9)
(D2 B2)       // 2x2x2 on UBR, giving XX-Cross on U (2/11)
(F D2 F')     // all edges, leaving 5c, -1 on normal (3-1/13)

skel: U' F' B R' # B2 D' L2 U' F2 @ D2 F' B2 D2
@ = [F2, U B U'] // insert 3c comm (8-4/17)
# = [R U' R', D] // insert 3c comm (8-2/23)

rewrite: U' F' B U' R' D R U R' D' { B2 D' L2 B U' F2 U B' } U' D2 F' B2 D2
{ = E' // insert slice (2-2/23)
} = E  // insert slice (2-3/22)