/summon FallingSand ~ ~1 ~ {Block:command_block,Data:1,TileEntityData:{Command:},Time:1,DropItem:0, Passengers:[{id:"FallingSand",Block:chain_command_block,Data:1,TileEntityData:{Command:/gamerule commandBlockOutput false},Time:1,DropItem:0, Passengers:[{id:"FallingSand",Block:chain_command_block,Data:1,TileEntityData:{Command:/fill ~2 ~-1 ~3 ~-2 ~7 ~8 stained_glass 10 hollow},Time:1,DropItem:0, Passengers:[{id:"FallingSand",Block:chain_command_block,Data:1,TileEntityData:{Command:/fill ~2 ~6