Redstone Fill clock

/summon FallingSand ~ ~1 ~ {Block:redstone_block,Time:1,DropItem:0,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:fill ~1 ~-1 ~ ~1 ~-6 ~ redstone_block},Time:1,DropItem:0,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:fill ~1 ~2 ~1 ~ ~-6 ~ air},Time:1,DropItem:0,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:/setblock ~1 ~-4 ~1 redstone_block},Time:1,DropItem:0,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:/setblock ~2 ~-3 ~1 command_block 0 0 {Command:fill ~6 ~5 ~-1 ~ ~ ~-1 redstone_block}},Time:1,DropItem:0,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:/setblock ~2 ~-2 ~-1 command_block 0 0 {Command:fill ~6 ~5 ~1 ~ ~ ~1 air}},Time:1,DropItem:0,Riding:{id:"FallingSand",Block:redstone_block,Time:1,DropItem:0,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:/gamerule commandBlockOutput false},Time:1,DropItem:0}}}}}}}}