mine

for i=20,1 do
turtle.dig()
turtle.forward()
turtle.digUp()
turtle.turnLeft()
turtle.dig()
turtle.forward()
turtle.digUp()
for i=1,2 do
turtle.turnRight()
turtle.forward()
end
turtle.dig()
turtle.forward()
turtle.digUp()
for i=1,2 do
turtle.turnLeft()
turtle.forward()
end
turtle.turnRight()
repeat 20
end