Nether portal in 1 command

/summon FallingSand ~ ~1 ~ {Block:command_block,Data:0,TileEntityData:{Command:"/fill ~4 ~3 ~ ~1 ~-1 ~ obsidian 0 destroy",auto:1b},Time:1,DropItem:0,Passengers:[{id:"FallingSand",Block:command_block,Data:0,TileEntityData:{Command:"/fill ~3 ~1 ~ ~2 ~-1 ~ fire 0 destroy",auto:1b},Time:1,DropItem:0,Passengers:[{id:"FallingSand",Block:command_block,Data:0,TileEntityData:{Command:"/fill ~ ~-3 ~ ~ ~ ~ air 0 destroy",auto:1b},Time:1,DropItem:0}]}]}