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I can think of 2 or 3 ways to do it.
1 - Find an outline font. Then you could give the characters a fill and still have an outline/border, and use any colors you want.
2 - Duplicate the text, make it a little bigger (by the amount of the width of the border that you want), and move it behind the original. It's a way of faking a border, but probably the least preferrable of these 3. (Some fonts won't behave properly for this.)
3 - Use a Stroke on the text.
Please let us know if you have further questions. Also please note the info in my signature, for some excellent instructional materials
