fill clock

summon FallingSand ~1 ~1 ~ {Time:1,Block:minecraft:redstone_block,Riding:{id:FallingSand,Time:1,Block:minecraft:command_block,TileEntityData:{Command:fill ~ ~-8 ~ ~ ~1 ~ minecraft:air},Riding:{id:FallingSand,Time:1,Block:minecraft:redstone_block,Riding:{id:FallingSand,Time:1,Block:minecraft:command_block,TileEntityData:{Command:summon FallingSand ~3 ~-4 ~ {Time:1,Block:minecraft:command_block,TileEntityData:{Command:say 3},Riding:{id:FallingSand,Time:1,Block:minecraft:command_block,TileEntityData:{Command:say 2},Riding:{id:FallingSand,Time:1,Block:minecraft:command_block,TileEntityData:{Command:say 1}}}}},Riding:{id:FallingSand,Time:1,Block:minecraft:redstone_block,Riding:{id:FallingSand,Time:1,Block:minecraft:command_block,TileEntityData:{Command:setblock ~2 ~-4 ~ minecraft:redstone_block},Riding:{id:FallingSand,Time:1,Block:minecraft:redstone_block,Riding:{id:FallingSand,Time:1,Block:minecraft:command_block,TileEntityData:{Command:setblock ~3 ~-2 ~ minecraft:command_block 0 replace {Command:fill ~-1 ~ ~ ~-1 ~3 ~ minecraft:redstone_block}},Riding:{id:FallingSand,Time:1,Block:minecraft:redstone_block,Riding:{id:FallingSand,Time:1,Block:minecraft:command_block,TileEntityData:{Command:setblock ~1 ~ ~ minecraft:command_block 0 replace {Command:fill ~1 ~ ~ ~1 ~3 ~ minecraft:stone}}}}}}}}}}}}