-1
summon Item ~ ~3 ~
{Riding:{Riding:{id:"Falling_block",Time:1,TileI
D:137,DropItem:0,TileEntityData:{Command:
"/summon Falling_block ~ ~15 ~
{Time:1,TileID:72,Data:1,DropItem:0,Riding:{i
d:"Falling_block
",TileID:137,Time:1,DropItem:0,TileEntityDa
ta:{Command:"/setblock ~ ~1 ~ air
"},Riding:{id:"...