Subvariables?

I am doing a study (epidemiological-medical) on the injured soldiers during current Iraqi conflicts, I have a lot of variables, but I am facing a problem, one of the variables is the site of injury, I can summarized it to upper limb and lower limb, but some times both of them injured so I put new value for (Both)
1= upper limb
2= lower limb
3= both
now the other variable is (Severity)
1=Minor
2= Moderate
3= Severe
4= Avulsive
The problem is, when the patient has (Both) upper and lower limb injured, sometimes the severity differs, I mean the upper limb injury may be mild but the lower limb injury is severe.
so how to put two values in one variable??
Thanks for all and best regards

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