create symetric static mesh instance

Hey, hallo
I am trying to make a construction Script to create 4 static mesh instance which will be symmetric in x and y-axis. For example, the position of the first object is a “Location” variable (a,b), then the other 3 instance should get a location (-a,b),(a,-b), (-a,-b). The rotation of them can be any value as input.
I know the index from “For Loop” is an Array, but how to use it that the second instance will be *-1 in Location X, *1 in Location Y
the third instance will be *1 in Location X, *-1 in Location Y
the fourth instance will be *-1 in Location X, *-1 in Location Y
or I only use a “sequence” node, without Loop
It will be great that someone can help me.

Well, you could do something like this I guess

Thanks a lot !