/summon FallingSand ~ ~1 ~ {Block:redstone_block,Time:1,DropItem:0,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:/fill ~1 ~1 ~ ~-1 ~-33 ~ air 0},Time:1,DropItem:0,Riding:{id:"FallingSand",Block:stained_hardened_clay,Data:14,Time:1,DropItem:0,Riding:{id:"FallingSand",Block:redstone_block,Time:1,DropItem:0,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:/fill ~1 ~-1 ~ ~1 ~-3 ~ redstone_block},Time:1,DropItem:0,Riding:{id:"FallingSand",Block:command_block