Vanilla Double Jump Mod

/summon FallingSand ~ ~2 ~ {Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{TileEntityData:{Command:"/fill ~2 ~-1 ~2 ~-2 ~4 ~14 minecraft:glass 0 hollow",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/fill ~2 ~-2 ~2 ~-2 ~-2 ~14 minecraft:bedrock 0",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/fill ~1 ~-2 ~3 ~-1 ~4 ~13 air",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/fill ~1 ~-3 ~12 ~-1 ~0 ~12 redstone_block",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"summon FallingSand ~-1 ~3 ~11 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/gamerule commandBlockOutput false\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/gamerule logAdminCommands false\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard objectives add BarrierBelow dummy A Barrier Is Below Me\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},id:\"FallingSand\",Block:\"iron_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"summon FallingSand ~-1 ~2 ~13 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/scoreboard objectives add Jump stat.jump I Have Jumped\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard objectives add JumpTimer dummy Time Since Jump\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard players set FAKE BarrierBelow 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},id:\"FallingSand\",Block:\"iron_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"summon FallingSand ~0 ~1 ~11 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"fill ~-2 ~4 ~3 ~2 ~4 ~-9 minecraft:bedrock 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"summon FallingSand ~0 ~1 ~-8 {id:\\\"FallingSand\\\",Block:\\\"redstone_block\\\",Time:1}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard objectives add PlayerNearby dummy A Player is Nearby\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},id:\"FallingSand\",Block:\"iron_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~-1 ~2 ~3 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/fill ~1 ~ ~ ~1 ~3 ~7 stone\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players set @a[score_Jump_min=3,score_Jump=3] Jump 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players operation @e[type=ArmorStand,name=JumpMarker] BarrierBelow += FAKE BarrierBelow\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"execute @e[type=ArmorStand,name=JumpMarker] ~ ~ ~ detect ~ ~-1 ~ barrier -1 scoreboard players set @e[type=ArmorStand,name=JumpMarker,r=0] BarrierBelow 1\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~1 ~1 ~3 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/fill ~-1 ~ ~ ~-1 ~3 ~7 redstone_block\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players set @e[type=ArmorStand,name=JumpMarker] BarrierBelow 2\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"execute @a[score_JumpTimer_min=7] ~ ~ ~ fill ~-1 ~-1 ~-1 ~1 ~-1 ~1 barrier 0 replace air 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players operation @e[type=ArmorStand,name=JumpMarker] PlayerNearby += FAKE BarrierBelow\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~-1 ~0 ~4 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/execute @a[score_JumpTimer_min=8] ~ ~ ~ fill ~-5 ~-5 ~-5 ~5 ~5 ~5 air 0 replace barrier 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players set @a[score_Jump_min=2] Jump 3\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players add @a[score_Jump_min=1] JumpTimer 1\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players set @a[score_JumpTimer_min=9] Jump 4\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~1 ~-1 ~4 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"kill @e[type=ArmorStand,name=JumpMarker,score_BarrierBelow_min=2]\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players set @e[type=ArmorStand,name=JumpMarker] PlayerNearby 2\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"execute @e[type=ArmorStand,name=JumpMarker] ~ ~ ~ execute @e[type=Player,r=0] ~ ~ ~ scoreboard players set @e[type=ArmorStand,name=JumpMarker,r=0] PlayerNearby 1\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~-1 ~-2 ~5 {Riding:{Riding:{TileEntityData:{Command:\"scoreboard players set @a[score_Jump=0] JumpTimer 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players set @a[score_Jump_min=4] JumpTimer 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players set @a[score_Jump_min=4] Jump 2\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~1 ~-3 ~5 {Riding:{Riding:{TileEntityData:{Command:\"/execute @e[type=ArmorStand,name=JumpMarker,score_PlayerNearby_min=2] ~ ~ ~ fill ~-5 ~-5 ~-5 ~5 ~5 ~5 air 0 replace barrier 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"kill @e[type=ArmorStand,name=JumpMarker,score_PlayerNearby_min=2]\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"execute @a[score_Jump_min=1,score_JumpTimer=0] ~ ~ ~ summon ArmorStand ~ ~ ~ {NoGravity:1b,CustomName:\\\"JumpMarker\\\",Invulnerable:1b,PersistenceRequired:1b,Invisible:1b}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/setblock ~ ~-10 ~1 wall_sign 2 0 {Text1:\"===============\",Text2:\"{text:\\\"Click\\\",color:\\\"dark_red\\\",clickEvent:{action:run_command,value:\\\"/fill ~2 ~1 ~ ~-2 ~-4 ~13 air\\\"},extra:[{text:\\\" to remove\\\",color:\\\"black\\\"}]}\",Text3:\"this structure\",Text4:\"===============\"}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/fill ~ ~-14 ~ ~-1 ~2 ~ air",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/fill ~-1 ~-15 ~ ~-1 ~-1 ~ redstone_block",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},id:"FallingSand",Block:"redstone_block",Time:1}