function iff (x,y,z)
if a[x][y][z]==1 then
turtle.select(1)
elseif a[x][y][z]==2 then
turtle.select(2)
elseif a[x][y][z]==3 then
turtle.select(3)
elseif a[x][y][z]==4 then
turtle.select(4)
elseif a[x][y][z]==5 then
turtle.select(5)
elseif a[x][y][z]==6 then
turtle.select(6)
elseif a[x][y][z]==7 then
turtle.select(7)
elseif a[x][y][z]==8 then
turtle.select(8)
elseif a[x][y][z]==9 then
turtle.select(9)
elseif a[x][y][z]==10 then
turtle.select(10)
elseif a[x][y][z]==11 then
turtle.select(11)
elseif a[x][y][z]==12 then
turtle.select(12)
elseif a[x][y][z]==13 then
turtle.select(13)
elseif a[x][y][z]==14 then
turtle.select(14)
elseif a[x][y][z]==15 then
turtle.select(15)
elseif a[x][y][z]==0 then
turtle.select(16)
end
end


a = {{{0,0,0,1,0,1,0,0,0},
      {0,0,0,0,0,0,0,0,0},
      {0,0,0,1,0,1,0,0,0}},

     {{0,0,0,2,0,2,0,0,0},
      {0,0,0,2,2,2,0,0,0},
      {0,0,0,2,0,2,0,0,0}},

     {{0,0,0,2,2,2,0,0,0},
      {1,2,2,2,2,2,0,0,0},
      {0,0,0,2,2,2,0,0,0}},

     {{0,0,2,0,0,0,0,0,0},
      {0,3,2,0,0,2,3,0,0},
      {0,0,2,0,0,0,0,0,0}},


     {{0,0,3,0,0,0,0,0,0},
      {0,0,0,0,0,0,0,3,3},
      {0,0,3,0,0,0,0,0,0}},


    {{0,0,0,0,0,0,0,0,0},
     {0,0,0,0,0,0,0,0,3},
     {0,0,0,0,0,0,0,0,0}},

    {{0,0,0,0,0,0,0,0,0},
     {0,0,0,0,0,0,0,0,3},
     {0,0,0,0,0,0,0,0,0}}}





for x=1, #a do
 for y=1, #a[x] do
  for z=1, #a[x][y] do
   iff(x,y,z)
   turtle.placeDown()
   turtle.forward()
 end


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

for y = 1,#a[x][y] do
turtle.forward()
end


turtle.turnRight()
turtle.turnRight()
end

turtle.turnLeft()
for y = 1,#a[x] do
turtle.forward()

end
turtle.turnRight()
turtle.up()
end