I want a point not occur if overlapped with another point, but appear if this point it is not visible
For now my condition is :If[E ∈ {A, B} , false, true]
is ok. (thanks Zbynek and abakus)
I want now this condition:
If[E ∈ {A, B} AND {A,B} VISIBLE=true , false, true]
Is that possible?
The same question 
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