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IReadOnlyCollection<IGridNode> set = grid.getMachines( TileSpatialPylon.class ); for (IGridNode gm : set) { if ( gm.meetsChannelRequirements() ) { SpatialPylonCluster c = ((TileSpatialPylon) gm.getMachine()).getCluster(); if ( c != null ) clusters.put( c, c ); } }