Stupid questions but I still don't know the answer

d is a move such as D, but you also grab the slice above it. So it is basically equivalent to U y' . l and r are similar. l is like L, but also grab the slice with it, equivalent to R x' . M is a middle slice. If you are looking at the cube, it is the slice between the left and right slices. I have some applets on notation here. There is also some good notation information here.
 
thanks now found a good page were to see
but your discriüption was a good extra cause the other one wasn't that good
 
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