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

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

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

      {{0,0,1,6,6,6,1,6,6,6,1,6,6,6,6,6,1,6,6,6,6,1,6,6,6,6,1,6,6,6,6,1,0,0}},

      {{0,0,4,6,6,6,4,6,6,6,4,6,4,4,4,4,4,6,4,4,4,6,4,4,4,4,6,4,4,4,6,6,4,0}},

      {{0,0,4,6,6,6,4,6,6,6,4,6,6,6,4,6,6,6,4,6,6,6,4,6,6,6,6,4,4,4,6,6,4,0}},

      {{0,0,0,4,7,7,7,4,7,7,4,7,7,7,4,7,7,7,4,7,7,7,4,7,7,7,7,4,4,4,7,7,4,0}},

      {{0,0,0,4,7,7,7,4,7,7,7,4,7,4,4,4,7,7,4,7,7,7,7,4,7,7,7,4,4,4,7,7,7,4}},

      {{0,0,0,0,4,7,3,4,7,7,3,4,7,7,3,4,7,3,4,7,7,7,3,4,7,7,7,7,7,7,7,7,3,4}},

      {{0,0,0,0,5,8,3,5,8,8,3,5,8,8,3,5,8,3,5,8,8,8,3,5,8,8,8,8,8,8,8,8,3,5}},

      {{0,0,0,0,5,3,3,5,8,3,3,5,3,3,3,5,3,3,5,8,3,3,3,5,8,8,8,8,8,8,8,3,3,5}},

      {{0,0,0,0,0,5,5,0,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,0}}}

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