On the whole, all you experienced and advanced students have to manage things very nicely, and if you occasionally come to me here for consultation and necessary instruction that will be easier for me and I can devote my time in finishing the books: Revision history
Diff selection: Mark the radio buttons of the revisions to compare and hit enter or the button at the bottom.
Legend: (cur) = difference with latest revision, (prev) = difference with preceding revision, m = minor edit.