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Mask from Math in Material Editor

I want to create a mask in my material that is generated from maths rather than a texture.
I want to be able to create a simple white square in a particular coordinate to use as a lerp mask but can't work out how or if it's even possible.
The closest math I've seen is from taking sprites out of a flipbook texture however this is kind of the reverse of what I want to do.

Any ideas would be great!:)

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