public void onWorldTick(WorldTickEvent event) {
		if (event.side.isServer()) {
			World world = event.world;
			HashSet<Item> items = new HashSet<Item>();
			items.add(Items.bone);
			items.add(Items.book);
			items.add(Items.feather);

			ArrayList<EntityItem> foundEntityItems = new ArrayList<EntityItem>();

			if (!world.isRemote) {
				if (bookSpawnDelay > 0) bookSpawnDelay--;
				else {
				List<Entity> entitiesInWorld = world.loadedEntityList;

				for(Entity entityInWorld : entitiesInWorld) {
					if(entityInWorld instanceof EntityItem) {
						EntityItem entityItemInWorld = (EntityItem)entityInWorld;
						if(entityItemInWorld.getEntityItem().getItem() == Items.book) {
							items.remove(Items.book);
							AxisAlignedBB areaBound = new AxisAlignedBB(
								entityItemInWorld.posX - 3, entityItemInWorld.posY - 3, entityItemInWorld.posZ - 3,
								entityItemInWorld.posX + 3, entityItemInWorld.posY + 3, entityItemInWorld.posZ + 3
							);
							List<Entity> entitiesWithinBound = world.getEntitiesWithinAABBExcludingEntity(entityItemInWorld, areaBound);

								for(Item item : items) {
									for(Entity entityWithinBound : entitiesWithinBound) {
										if(entityWithinBound instanceof EntityItem) {
											EntityItem entityItemWithinBound = (EntityItem)entityWithinBound;
											if(entityItemWithinBound.getEntityItem().getItem() == item) {
												items.remove(item);
												foundEntityItems.add(entityItemWithinBound);
												if(items.isEmpty()) {
													for(EntityItem foundEntityItem : foundEntityItems) {
														ItemStack foundItemStack = foundEntityItem.getEntityItem();
														bookSpawnDelay += 20;
														foundItemStack.stackSize--;
														if (foundItemStack.stackSize == 0) {
															world.removeEntity(foundEntityItem);
															foundEntityItems.remove(foundEntityItem);
														}
														double x = entityItemInWorld.posX;
														double y = entityItemInWorld.posY;
														double z = entityItemInWorld.posZ;
														LogHelper.info("Items is empty!");

														if(foundEntityItems.isEmpty()) {
															LogHelper.info("Found Entity Items is empty!");
															WorldServer worldServer = (WorldServer) world;
															worldServer.spawnParticle(EnumParticleTypes.SMOKE_LARGE,
																	false, x + 0.5D, y + 1.0D, z + 0.5D, 1, 0.0D,
																	0.0D, 0.0D, 0.0D, new int[0]);
															world.spawnEntityInWorld(new EntityItem(world, x, y, z, new ItemStack(ARKCraftItems.info_book)));
															world.spawnEntityInWorld(new EntityItem(world, x, y, z,
																	new ItemStack(ARKCraftItems.info_book)));
														}
													}
												}
											}
										}
									}
								}

							}
						}
					}



			}
			}
		}
	}