Iron Mites In One Command

Paste in command block

/summon FallingSand ~ ~1 ~ {Block:"redstone_block",Time:3,Passengers:[{id:"FallingSand",Block:"activator_rail",Time:3,Passengers:[{id:"MinecartCommandBlock",Command:/gamerule commandBlockOutput false},{id:"MinecartCommandBlock",Command:/setblock ~1 ~-2 ~ command_block 5 replace {Command:/scoreboard players tag @e[type=Item,name=!IronFirstTick] add SpawnIronMite {Item:{id:"minecraft:iron_ore"},PickupDelay:10s}}},{id:"MinecartCommandBlock",Command:/setblock ~2 ~-2 ~ chain_command_block 5 replace {auto:1b,Command:/scoreboard players tag @e[type=Item] add IronOre {Item:{id:"minecraft:iron_ore"}}}},{id:"MinecartCommandBlock",Command:/setblock ~4 ~-2 ~ chain_command_block 5 replace {auto:1b,Command:/entitydata @e[tag=IronOre] {CustomName:"IronFirstTick"}}},{id:"MinecartCommandBlock",Command:/setblock ~3 ~-2 ~ chain_command_block 5 replace {auto:1b,Command:/execute @e[tag=SpawnIronMite] ~ ~ ~ summon Silverfish ~ ~ ~ {Tags:["IronMite"],CustomName:"Iron Mite",Health:3}}},{id:"MinecartCommandBlock",Command:/setblock ~5 ~-2 ~ chain_command_block 1 replace {auto:1b,Command:/effect @e[tag=IronMite] minecraft:slowness 10 0 true}},{id:"MinecartCommandBlock",Command:/setblock ~5 ~-1 ~ chain_command_block 4 replace {auto:1b,Command:/scoreboard players tag @e[tag=SpawnIronMite] remove SpawnIronMite}},{id:"MinecartCommandBlock",Command:/setblock ~3 ~-1 ~ chain_command_block 5 replace {auto:1b,Command:/setblock ~-2 ~ ~ air}},{id:"MinecartCommandBlock",Command:/setblock ~2 ~-1 ~ command_block 5 replace {Command:summon FallingSand ~-1 ~-.5 ~ {Block:"redstone_block",Time:3,Motion:[0.0,0.1,0.0]}}},{id:"MinecartCommandBlock",Command:/setblock ~1 ~-1 ~ redstone_block},{id:"MinecartCommandBlock",Command:kill @e[r=2,type=MinecartCommandBlock]}]}]}