sample

turtle.refuel()
function row()
  for i = 1,5 do
  turtle.dig()

  turtle.forward()
 turtle.turnRight()
   end
end

turtle.digDown()
turtle.down()

   row()
   turtle.turnRight()
   turtle.forward()
   turtle.turnLeft()
     turtle.forward()
     for i = 1,4 do

     turtle.dig()

     turtle.forward()
     turtle.turnRight()
     end
     turtle.forward()
     turtle.turnLeft()
   turtle.dig()
   turtle.forward()
   turtle.dig()
   turtle.forward()
   turtle.dig()
   turtle.forward()
     turtle.turnLeft()
     turtle.dig()
     turtle.forward()
     turtle.dig()
     turtle.forward()
     turtle.turnLeft()
     turtle.forward()
     turtle.turnLeft()
     turtle.dig()
     turtle.forward()
     turtle.turnRight()
     turtle.dig()
     turtle.forward()
     turtle.turnRight()
     turtle.dig()
     turtle.forward()
     turtle.dig()
     turtle.forward()
     turtle.turnRight()
     turtle.dig()
     turtle.turnLeft()
     turtle.dig()
     turtle.forward()
     turtle.turnRight()
     turtle.dig()
     turtle.turnLeft()
     turtle.turnLeft()
     turtle.dig()
     turtle.forward()
     turtle.dig()
     turtle.forward()
     turtle.dig()
     turtle.forward()
     turtle.turnLeft()
     turtle.dig()
     turtle.forward()
     turtle.dig()
     turtle.turnLeft()
     turtle.dig()
     turtle.forward()
     turtle.dig()