View difference between Paste ID: 7HKtPGU7 and r4AVCvA5
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1
-- 0 - empty 
2
-- 1 - black
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-- 2 - red
4
5
art = {
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    {
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      {2, 1, 1, 2},
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      {1, 0, 0, 1},
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      {1, 0, 0, 1},
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      {2, 1, 1, 2},
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    },
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    {
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      {1, 0, 0, 1},
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      {0, 0, 0, 0},
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      {0, 0, 0, 0},
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      {1, 0, 0, 1}, 
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     },
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     {
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      {1, 0, 0, 1},
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      {0, 0, 0, 0},
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      {0, 0, 0, 0},
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      {1, 0, 0, 1}, 
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     },
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     {
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      {2, 1, 1, 2},
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      {1, 0, 0, 1},
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      {1, 0, 0, 1},
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      {2, 1, 1, 2}, 
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    }    
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}
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for z = 1, #art do 
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    for y = 1, #art[z] do 
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        for x = 1, #art[z][y] do
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          slot = art[z][y][x]
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          if slot ~= 0 then
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                turtle.select(slot)
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                turtle.placeDown()
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          end
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          turtle.forward()
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        end
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        for i = 1, #art[z][y] do
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          turtle.back()
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        end
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        -- replace those comands to turtle go up.
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        turtle.turnRight()
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        turtle.forward()
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        turtle.turnLeft()
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    end  
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    turtle.turnLeft()
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    for n = 1, #art[z] do
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       turtle.forward()
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    end
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    turtle.turnRight()
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    turtle.up()
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end