local function gf()  while not turtle.forward()   do end end
local function gb()  while not turtle.back()      do end end
local function gu()  while not turtle.up()        do end end
local function gd()  while not turtle.down()      do end end
local function gl()  while not turtle.turnLeft()  do end end
local function gr()  while not turtle.turnRight() do end end
local function df()  turtle.dig()       end
local function du()  turtle.digUp()     end
local function dd()  turtle.digDown()   end
local function pf()  turtle.place()     end
local function pu()  turtle.placeUp()   end
local function pd()  turtle.placeDown() end
local function sf()  turtle.suck()      end
local function su()  turtle.suckUp()    end
local function sd()  turtle.suckDown()  end
local function Df()  turtle.drop()      end
local function Du()  turtle.dropUp()    end
local function Dd()  turtle.dropDown()  end
local function ss(s) turtle.select(s)   end

-- go down & restock & go up ---------
print("phase1")
gl() for i=1,8 do gb() end
print("phase2")
gr() for i=1,8 do gf() end
print("phase3")
for i=1,23 do gd() end
print("phase4")
gl() gl() ss(1)
print("phase5")
for i=1,6 do sf() end
print("phase6")
--ss(9) Df()
if noLadder==0 then ss(14) Df() ss(15) Df() end
gr() gr()
print("phase7")
for i=1,23 do gu() end
print("phase8")
for i=1,8 do gb() end gr()
print("phase9")
for i=1,12 do gb() end gl()
print("phase10")
gu() gu() gu() gu()
print("phase11")