NearbyChestBlockBag bag = new NearbyChestBlockBag(pt);
for (int y = -1; y <= 0; y++) {
bag.addSingleSourcePosition(world, pt.add(1, y, 0));
bag.addSingleSourcePosition(world, pt.add(2, y, 0));
bag.addSingleSourcePosition(world, pt.add(-1, y, 0));
bag.addSingleSourcePosition(world, pt.add(-2, y, 0));
bag.addSingleSourcePosition(world, pt.add(0, y, 1));
bag.addSingleSourcePosition(world, pt.add(0, y, 2));
bag.addSingleSourcePosition(world, pt.add(0, y, -1));
bag.addSingleSourcePosition(world, pt.add(0, y, -2));