2m L of Dunes is a R facing corner. Start by scrambling (or roping) up this to the top of the huge flake.
25m (16) Grey slab to strenuous chalked wall, then head L up stepped ramp to a belay ledge on the arete. (The original avoided the overlap by going way off R - this better direct way was done by Keith Lockwood and Geoff Schirmer 4/2/78).
10m (-) Step L then up over worrisome blocks and belay under orange corner. 2b: Variant 15m Straight up arete with reasonable pro and rock.
15m (16) Up orange corner then R under arching roof to arete.
25m (-) Up the line then L onto wall and belay under steep little crack (which is pitch 5 of Dunes).
32m (-) Traverse L, ignore scrubby crack, and take the balancy grey slab then join the final corner of Dunes.