local height = 4
local width = 9

function forward()
  turtle.forward()
end

function up()
  turtle.up()
end

function down()
  turtle.down()
end

function left()
  turtle.turnLeft()
  forward()
  turtle.turnRight()
end

function right()
  turtle.turnRight()
  forward()
  turtle.turnLeft()
end

function chop()
  turtle.dig()
end

function chopUp()
  turtle.digUp()
end

function goToFloor()
  for i = 0,height,1 do
    down()
  end
end

function mineRow()
  for i = 0,width,1 do
    local tree = true
    if tree then
      mineTree()
    end

    left()
  end
end

function goBackToStart()
  turtle.turnRight()
  for i = 0,width,1 do
    forward()
  end
  turtle.turnLeft()
end

function mineTree()
  for i = 0,height,1 do
    chop()
    chopUp()
    up()
  end

  for i = 0,height,1 do
    down()
  end
end

mineRow()
mineTree()