Generate a numeric value from two text inputs

I'm trying to generate a numeric Risk Rating based on two text values that correspond with a numeric value. For example a Likelihood of Rare, Unlikely, Possible etc. Also, we have a Consequence of Critical, Major, Moderate etc. When the two are in a matrix the X and Y values give a Risk Rating. The higher the Likelihood and the higher the Consequence means it's a higher risk. How do I generate a matrix based on two values to produce a single result.

Example below.

The numeric value is probably not needed, even the rating alone will be OK.

Open to any suggestions.

Thanks.

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