F2L · Separated on top

F2L 10

U'
R
U
R'
U
R
U
R'
How to recognise it
Corner above the slot with white facing right; the edge is on the left, its top colour matching the corner's front sticker.
Algorithms
Relations
Mirror
F2L 9
Your algorithm backwards
R U' R' U' R U' R' U
solves F2L 4
That's why your scrambles are never the inverse of the algorithm: you'd be practising F2L 4 without knowing it. CubeDojo builds a random state with this case and checks it comes out.
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