I try to make a ruleset out of this (it seems to be more deterministic(easy) than I first believed):
1. identify the L/R case (white/yellow), there are 23 cases
2a. There are two corners with yellow stickers, these corners have 2 colors in common (one is yellow) -> ignore this
2b. The remainig two stickers on the yellow corners are always opposite colors. -> these are the first two stickers of the second pattern
3a+b. Just the same as step 2 to get the next two stickers for the second pattern.
4. the second patter is again one of the 23 cases and the combination tells me the alg.
my considerations (?):
a) the 23 cases are the same for both steps in theory, but in practise I memoryse pattern 1 as two set of stickers of the same color, while I have to identify pattern 2 as set of opposite colored stickers
b) there are only 42 pattern combos, but they can be combined in one of two orders.