1 - see CPAN, modularization is easy 'nuff said. 2 - Logic. Just understand basic logic. No one can break logical code unless they invent a square circle. 3 - Don't drop the the lowest common programmer. Just keep it relatively simple and you'll be find (common sense stuff, break complex operations into multiple lines, etc) 4 - Program for yourself and you won't need to worry about this.
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