With 1 command block : Ores

My first "with one command block". This command spawn 9 iron,gold,diamond and emerald ores. Command :

/summon FallingSand ~ ~2 ~ {Block:redstone_block,Time:1,Riding:{id:FallingSand,Block:command_block,Time:1,TileEntityData:{Command:/fill ~ ~1 ~ ~ ~-8 ~ air},Riding:{id:FallingSand,Block:redstone_block,Time:1,Riding:{id:FallingSand,Block:command_block,Time:1,TileEntityData:{Command:/fill ~-5 ~-7 ~-1 ~-7 ~-7 ~1 iron_ore},Riding:{id:FallingSand,Block:redstone_block,Time:1,Riding:{id:FallingSand,Block:command_block,Time:1,TileEntityData:{Command:/fill ~1 ~-5 ~5 ~-1 ~-5 ~7 gold_ore},Riding:{id:FallingSand,Block:redstone_block,Time:1,Riding:{id:FallingSand,Block:command_block,Time:1,TileEntityData:{Command:/fill ~-1 ~-3 ~-5 ~1 ~-3 ~-7 emerald_ore},Riding:{id:FallingSand,Block:redstone_block,Time:1,Riding:{id:FallingSand,Block:command_block,Time:1,TileEntityData:{Command:/fill ~5 ~-1 ~1 ~7 ~-1 ~-1 diamond_ore}}}}}}}}}}}