command

/summon FallingSand ~ ~1 ~ {Time:1b,Block:stone,Passengers:
[{id:FallingSand,Time:1b,Block:redstone_block,Passengers:
[{id:FallingSand,Time:1b,Block:activator_rail,Passengers:
[{id:MinecartCommandBlock,Passengers:

[

{id:MinecartCommandBlock,Command:/setblock ~2 ~-3 ~2 repeating_command_block 1 replace {auto:1b,Command:"/clone ~ ~ ~ ~ ~2 ~ ~1 ~ ~"}},
{id:MinecartCommandBlock,Command:/setblock ~2 ~-2 ~2 chain_command_block 1 replace {auto:1b,Command:"/clone ~ ~-1 ~ ~ ~1 ~ ~ ~-1 ~1"}},
{id:MinecartCommandBlock,Command:/setblock ~2 ~-1 ~2 repeating_command_block 1 replace {auto:1b,Command:"/summon ArmorStand ~ ~1 ~ {Motion:[0.0,1.0,0.0]}"}}

]

}]}]}]}