Escher Initial Command

summon Item ~ ~4 ~ {Age:5996,Passengers:[{id:FallingSand,Time:1,Data:0,TileID:152,Passengers:[{id:FallingSand,Time:1,Data:0,TileID:157,Passengers:[{id:MinecartCommandBlock,Command:buffer,Passengers:[{id:MinecartCommandBlock,Command:setblock ~ ~-2 ~ stone},{id:MinecartCommandBlock,Command:summon ArmorStand ~ ~-1. ~ {CustomName:OCSSMarker,NoGravity:1},Passengers:[{id:MinecartCommandBlock,Command:/kill @e[type=Item,r=4],Passengers:[{id:MinecartCommandBlock,Command:setblock ~ ~ ~ air,Passengers:[{id:FallingSand,Time:1,Block:minecraft:command_block,TileEntityData:{Command:kill @e[type=MinecartCommandBlock,r=4],auto:1},Passengers:[{id:FallingSand,Time:1,Block:minecraft:command_block,TileEntityData:{Command:fill ~ ~1 ~ ~ ~-2 ~ air,auto:1}}]}]}]}]}]}]}]}]}