For design purposes, it is convenient to lay out the sprite on paper
first. You can show the desired colors as numbers from 0 to 3. For
example, the spaceship shown above might look like this:


                        0000122332210000
                        0001223333221000
                        0012223333222100
                        0001223333221000
                        0000122332210000


The next step is to convert the numbers 0-3 into binary numbers, which
will be used to build the  color descriptor words  of the sprite
 data structure . The next section shows how to do this.

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