ossia cadenza

[2xtreme619]

Hey

I can play half of the ossia cadenza for rach 3, but i want to learn the beginning,  first off what does the 6 mean above each of the left hand notes in the sheet music, and the first couple of bars ( it has E   F  A   E  D   F  A  D   C  F  A  C etc) going down by octaves E d c B B flat A and so on, with F  A between them if you understand me lol! im having trouble playing it up the speed, my left hand sucks with fast notes! my trouble is  im not going down the whole time with left like E  A  F  E  but that is wrong i have to go  E down to F then back up to A then down to E, sorry if im confusing people! its just so hard for me to do this,
any suggestions or help with the finguring