ABBA

summon MinecartCommandBlock ~ ~1 ~ {Command:summon MinecartCommandBlock ~ ~1 ~ {Command:kill @e[type=MinecartCommandBlock,r=1],Riding:{id:MinecartCommandBlock,Command:setblock ~ ~-1 ~1 redstone_block,Riding:{id:MinecartCommandBlock,Command:setblock ~ ~ ~1 command_block 0 replace {Command:fill ~ ~-2 ~-1 ~ ~ ~ air},Riding:{id:MinecartCommandBlock,Command:fill ~1 ~-3 ~ ~-9999448 ~-10000035 ~-10000416 air 0 replace barrier,Riding:{id:MinecartCommandBlock,Command:setblock ~7 ~-3 ~2 unpowered_repeater 6,Riding:{id:MinecartCommandBlock,Command:setblock ~6 ~-3 ~3 unpowered_repeater 5,Riding:{id:MinecartCommandBlock,Command:setblock ~6 ~-3 ~1 unpowered_repeater 7,Riding:{id:MinecartCommandBlock,Command:setblock ~5 ~-3 ~2 unpowered_repeater 6,Riding:{id:MinecartCommandBlock,Command:setblock ~4 ~-3 ~3 unpowered_repeater 5,Riding:{id:MinecartCommandBlock,Command:setblock ~4 ~-3 ~1 unpowered_repeater 7,Riding:{id:MinecartCommandBlock,Command:setblock ~3 ~-3 ~2 unpowered_repeater 6,Riding:{id:MinecartCommandBlock,Command:setblock ~2 ~-3 ~3 unpowered_repeater 5,Riding:{id:MinecartCommandBlock,Command:setblock ~2 ~-3 ~1 unpowered_repeater 7,Riding:{id:MinecartCommandBlock,Command:setblock ~1 ~-3 ~2 unpowered_repeater 6}}}}}}}}}}}}}},Riding:{id:MinecartCommandBlock,Command:setblock ~1 ~-3 ~1 iron_block 0,Riding:{id:MinecartCommandBlock,Command:setblock ~1 ~-3 ~3 iron_block 0,Riding:{id:MinecartCommandBlock,Command:setblock ~1 ~-3 ~4 sticky_piston 1,Riding:{id:MinecartCommandBlock,Command:setblock ~3 ~-3 ~1 iron_block 0,Riding:{id:MinecartCommandBlock,Command:setblock ~3 ~-3 ~3 iron_block 0,Riding:{id:MinecartCommandBlock,Command:setblock ~3 ~-3 ~4 sticky_piston 1,Riding:{id:MinecartCommandBlock,Command:setblock ~5 ~-3 ~1 iron_block 0,Riding:{id:MinecartCommandBlock,Command:setblock ~5 ~-3 ~3 iron_block 0,Riding:{id:MinecartCommandBlock,Command:setblock ~5 ~-3 ~4 sticky_piston 1,Riding:{id:MinecartCommandBlock,Command:setblock ~7 ~-3 ~0 lever 4,Riding:{id:MinecartCommandBlock,Command:setblock ~7 ~-3 ~1 iron_block 0,Riding:{id:MinecartCommandBlock,Command:setblock ~7 ~-3 ~3 iron_block 0,Riding:{id:MinecartCommandBlock,Command:setblock ~7 ~-3 ~4 sticky_piston 1,Riding:{id:MinecartCommandBlock,Command:setblock ~1 ~-2 ~4 iron_block 0,Riding:{id:MinecartCommandBlock,Command:setblock ~3 ~-2 ~4 iron_block 0,Riding:{id:MinecartCommandBlock,Command:setblock ~5 ~-2 ~4 iron_block 0,Riding:{id:MinecartCommandBlock,Command:setblock ~7 ~-2 ~1 wooden_button 5,Riding:{id:MinecartCommandBlock,Command:setblock ~7 ~-2 ~4 iron_block 0,Riding:{id:MinecartCommandBlock,Command:kill @e[type=ArmorStand,name=STRCMD],Riding:{id:MinecartCommandBlock,Command:gamerule commandBlockOutput false,Riding:{id:FallingSand,Block:activator_rail,Time:1,Riding:{id:FallingSand,Block:redstone_block,Time:1,Riding:{id:FallingSand,Block:stone,Time:1}}}}}}}}}}}}}}}}}}}}}}}}