how to use summon command in minecartcommandblock

/summon MinecartCommandBlock ~3 ~10 ~ {Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{id:"FallingSand",Time:1,TileID:152,DropItem:0},id:"FallingSand",Time:1,TileID:157,DropItem:0},id:MinecartCommandBlock,Command:"/setblock ~1 ~-2 ~ minecraft:redstone_block 0 replace"},id:MinecartCommandBlock,Command:"/setblock ~1 ~-1 ~ minecraft:activator_rail 0 replace"},id:MinecartCommandBlock,Command:"/setblock ~1 ~0 ~ minecraft:air 0 replace"},id:MinecartCommandBlock,Command:"/setblock ~1 ~1 ~ minecraft:air 0 replace"},id:MinecartCommandBlock,Command:"/setblock ~-2 ~-2 ~ minecraft:air 0 replace"},Command:"/setblock ~-2 ~-1 ~ minecraft:air 0 replace"}