the thing is really
i understand what's going on
and even more, i know that be able to give this notation will not actually help me understand anything it has to do with
it's basically just notation but i have no idea what they are doing
so seeing a few examples d3 f2 ...etc. and then seeing the final table and notation
i definitely will be able to reverse it
i learned calculus very well completely by looking at answers and working backwards, it just works well with things that are distinct
but...it doesn't work with analysis 