To get the final coordinates, you have to answer a few questions.
How high is Mount Everest in meters ABCD.
The year of the first official ascent of Everest 19EF.
The year of the first official ascent of Everest from the North Ridge 19GH.
The final can be found at
N(D-F)(A-B) (G-C)(A-B+D+H) . (B-D)(G-E)(E+F-C) W(A-B)(A-B)(A-C) (A-B)(E-F) . (D-E)((A+D)/(G-C))((D*H)+(C*H)+(E-C))