Pre-Op starts just left of Post-Op
, just below a ledge 2 small pines are growing out of. Scramble up to this ledge, and climb up the left side of a flake eventually reaching right to the other side of flake to pull past a hard section. Now follow cracks right on the arete all the way up to a roof, reach up and right to a jug, and swing right onto the face and up to the anchors on Post-op
(by the bent pine tree) and lower. There is still lots of lichen on this climb making judicious foot placement necessary.