M U’ (r U2’ r’) U’ (R U’ R’) M’ (dot on UFR corner)
M’ (R’ U’ R U’) (r’ U2’ r) U’ M (dot on UBL corner)
OLL3 and OLL4 are in a symmetrical relationship. So, one easy way is to use the symmetrical algorithms of OLL3 as follows.
f’ (L’ U’ L U) f U F’ (L’ U’ L U) F (dot on UFR corner)
F’ (U’ L’ U L) F U f’ (U’ L’ U L) f (dot on UBL corner)
But these are not so “kind” for me, right-handed, so I didn’t adopt them. I wish I were an ambidextrous.
In my option, if you write in reverse the first one letter by letter, it will be the second one.
Exciting Rubik’s cube 