Reproduction. One layed some eggs then another and another and then BOOM here they are.
Lynda.com is a very good source to start with. Totally recommend you to check it out
You would have 1234000 Megabytes
Motherboard
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A for loop is typically used in situations where the number of cycles for the loop is known before hand. One thing that uses for loops is video rendering software, it uses it to render each file and allocate each rendered file to its specified destination.