ErrorTest

x, y, z, f = 0, 0, 0, 0

function forward()
  if turtle.forward() then
    if f == 0 then
      x = x + 1
    elseif f == 1 then
      z = z + 1
    elseif f == 2 then
      x = x - 1
    elseif f == 3 then
      z = z - 1
    end
    return true
  end
  return false
end

function back()
  if turtle.back() then
    if f == 0 then
      x = x - 1
    elseif f == 1 then
      z = z - 1
    elseif f == 2 then
      x = x + 1
    elseif f == 3 then
      z = z + 1
    end
    return true
  end
  return false
end

function up()
  if turtle.up() then
    y = y + 1
    return true
  end
  return false
end

function down()
  if turtle.down() then
    y = y - 1
    return true
  end
  return false
end

function left()
  turtle.turnLeft()
  f = (f+3)%4
end

function right()
  turtle.turnRight()
  f = (f+1)%4
end

function home()
  while y ~= 0 do
    if y < 0 then
      turtle.digUp()
      up()
    elseif y > 0 then
      turtle.digDown()
      down()
    end
  end
  if z > 0 then
    while f ~= 3 do
      left()
    end
  elseif z < 0 then
    while f ~= 1 do
      left()
    end
  end
  while z ~= 0 do
    forward()
  end
  if x > 0 then
    while f ~= 2 do
      left()
    end
  elseif x < 0 then
    while f ~= 0 do
      left()
    end
  end
  while x ~= 0 do
    forward()
  end
end

forward()
forward()
forward()
local c = "lenis pick"
c = c + 4