Adjacent Corner Swap

PLL T Perm

One set of headlights and no solved bar, with a matching pair on each face beside them.

The case

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Algorithm

R U R' U' R' F R2 U' R' U' R U R' F'

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The first PLL most people learn, and its own inverse.

→Exactly one face has matching corners, and the edge between them does not match: headlights, never a solved bar.
→No face is fully solved. The two faces either side of the headlights each show a matching corner-edge pair.
→That mismatched edge is the F perm tell: F perm has the same single set of matching corners, but there the edge completes a solved bar.