1 Look 2 Alg sets are ways to reduce the number of algs for subsets. Some subsets have too many algs to realistically learn, but with 1 Look 2 Alg you can still do all those cases with one look. You recognize the case you have, then execute an alg that solves part of the subset, without affecting the other part. Immediately afterwards, you go straight into the other alg. An example of this would be if you don't want to learn full OLL, you do an EO that doesn't change the CO, and then go straight into CO. These 1 Look 2 Alg subsets are for cases with many more algs though, up in the hundreds or possibly thousands.