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If the two rows are of equal length you use a fixed-sized font and can write your tables in that program. Use spaces and tabs to create something like in Knight Otu's post. If the rows are NOT of equal length you will get a table that looks weird and misaligned. Try to change the font to Lucida Sans Unicode or perhaps Courier (New).
When you are done, copy it and put it within [code]a code block[/code]