What is the meaning of purple color in CRISPR/Cas9 -TEP1b shapes of game rule??

hi everyone

i am solving crispr problem. There are several rules, and seventh~ nineth boxes are the shapes of design.

Requirement contains red, white, and purple. I know the meaning of red(no shape in my design) and white(shape exists). But i dont know what the purple one exactly means!

Puple one is matched in target mode, but there is no such a shape in natural mode.

I thought i should follow the purple shape, but proposed shapes by other participants dont have the purple shape in their designs in natural mode.

So i dont have to make my design fit on that purple shape??, is it just template??
let me know the meaning of purple one, please!!!


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