A couple of things are hard to read.
The two colums on the right hand side are used to generate a "red" map and a "green" map, they're combined in the upper left node.
The two Comp nodes separate the red and green channels: a Component value of 0 means red, a Compnent value of 1 means green. The color swathes are pure white (255,255,255).
The outputs of the Comp nodes are added using a straightforward Math -> Add node, one input set at value 256, the other at value 1.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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