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]==0 then
turtle.select(16)
end
end

a={{{1,1,1,1,1,1},
   {1,1,1,1,1,1},
   {1,1,1,1,1,1},
   {1,1,1,1,1,1},
   {1,1,1,1,1,1},
   {1,1,1,1,1,1},
   {1,0,0,0,0,1},
   {1,0,0,0,0,1},
   {1,0,0,0,0,1},
   {1,0,0,0,0,1},
   {1,1,1,1,1,1},
   {1,1,1,1,1,1},
   {3,3,3,3,3,3},
   {3,3,3,3,3,3},
   {3,3,3,3,3,3},
   {3,3,3,3,3,3},
   {3,3,3,3,3,3},
   {3,3,3,3,3,3}},
}

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