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[Sameeralord]

Hi Guys,
I was given this pattern to complete. I know it should be really easy for most of you guys. But the reason I didn't try is there are some rules or something involved with this. Some one told me a shape can't repeat it self if that shape is in a column or row. Anyways I'm confused. If you know can you please explain to me the basic rules for patterns likes this. The question is fill out the missing square according to the pattern. Thanks heaps!!