Selects edges using a primitive attribute that have different values for each primitive of the edge.
It's much faster than the default Group from Attribute Boundary SOP. It shows once again the power of half edges in VEX.
https://www.dropbox.com/s/cb33kinmo42b26l/SelectEdgesByPrimitiveAttribute_SOP_Animatrix.otl?dl=1
https://www.dropbox.com/s/1d3dmz1p2kkg0m1/SelectUnsharedEdges_SOP_Animatrix.otl?dl=1