Magnetic-Properties of the Triple Perovskite-Rock-Salt Intergrowth Cuproplumbates Ba4-Xpb3-Xcuxo10-Delta (X-Less-Than-or-Equal-to-0.33, Delta-Less-Than-or-Equal-to-0.60) - Evidence of Anomalous Cu2+-O-Pb4+-O-Cu2+ Clustering