What logical function should i use to do a union of two raster files in GRASS?

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The files are :DEM and roads. For the following i did euclid distance and then reclass. Now i need to know with what logical function to combine them

elevation rank DEM < 300 10 DEM > 300 0 distance rankproximity to roads < 2000 10 proximity to roads > 2000 5

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