1x3

term.write("How far shall i dig?:  ")
distance = read()
print("Digging a 1x3 blocks for "..distance.." blocks...")

 for i = 1, distance
 do
 turtle.dig()
 turtle.forward()
 turtle.turnLeft
 turtle.dig()
 turtle.turnRight()
 turtle.turnRight()
 turtle.dig()
 turtle.turnLeft()
end