recognizing plls

each day ill post a pll and we discuss how we recognize it
today: Ua and Ub

first i look around and see all of the corners are correct. i hold it so the solved edge is at UF and look at UR. if UR and UF are opposite colors then i do R2 U' R' U' R U R U R U' R. IF UR and UF are not opposite colors then i do R' U R' U' R' U' R' U R U R2

if i see UBL UBR and UB solved, i look at UF, if it matches Lface i do Ua, if it matches Rface, i do Ub

Aa and Ab:

first i postition the 1x1x2 block in the bottom left corner and look at the R side. if the corners are the same colors, i do R2 B2 R F R' B2 R F' R. if not i do its inverse

i have a different alg, but i recognize the pll the same way