Do you sell custom design / custom print T-Shirts?

Let's say there is a shopify store selling two custom designs: 1) A dog graphics and 2) A cat graphics

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They can be printed on either a Black T-Shirt or a Blue T-Shirt. The store has 100 Black T-Shirt and 100 Blue T-Shirt.

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Usually 4 separate products will be created on Shopify:

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