List of lists and overall data manipulation

Hi,

I am trying to wrap my head around best practices when dealing with constant streams of data, and what are the best ways to manipulate them.

Let's say I have an outlet of an object spitting out lists that look something like this:

A1 A2 B1 B2 C1 C2 ... Z1 Z2

And some examples of what I'm looking to learn how to do:

1. If A1 ... Z1 are floats ranging from 0. to 1. (in no particular order) and A2 ... Z2 are ints ranging from 1 to 100 (in no particular order), what is the best way to get a list of values A2 ... Z2 sorted by the values of A1 ... Z1?

2. The example above, but for the value of A1*A2 ... Z1*Z2 sorted by the value of A1 ... Z1

Any help would be greatly appreciated, thank you!