summon FallingSand ~ ~1 ~ {Block:redstone_block,Time:1,DropItem:0,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:/fill ~1 ~1
summon FallingSand ~ ~1 ~ {Block:redstone_block,Time:1,DropItem:0,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:/fill ~1 ~1