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Each text of a program has his own Dragon. To get this Dragon in your project you need to get the source code. It's enough. As soon as you are forced to make something with the code, you meet the Dragon living in.

An experienced developer can feel the Dragon's size early. If the Dragon is big, the proved fighter begins "small changes" by rewriting of the source code he shall modify. If the programmer is young or self-assured, he obtains experience.