public void onBlockPlacedBy(World world, int x, int y, int z, EntityLivingBase entity, ItemStack is) {
world.setBlock(x, y + 1, z, Blocks.air);
world.setBlock(x, y + 2, z, Blocks.air);
world.setBlock(x, y + 3, z, Blocks.air);
world.setBlock(x, y + 4, z, Blocks.air);
world.setBlock(x, y + 5, z, Blocks.air);
world.setBlock(x, y + 6, z, Blocks.air);
}