What colours on Lightning Coil

New to the game don't know a lot about this item. I'm going to vaal it. I'd like to have the correct colours in the sockets just in case the vaal does nothing. Currently has 6s 5L. Does anyone know the most common colour combination?

More likely to roll R and G since it's STR and DEX item.
Not unusual to roll one blue but would be rarer for 2 or more blue.
Not sure if there are hard numbers anywhere, you just know that tendency for all of one color will be easier the purer the item in stat.