Progressive dinner

I have one question. Can I use a equation such as Abs(x1-x2) ≥ 6,  
where Abs is absolute value.

I think I'm making progress. I restated the problem using only house  
and couple variables, since house implies meal (meal 1 = houses  
11-19, meal 2 = houses 20-29, meal 3 = houses 1-10). I'm stuck  
somewhat on the eliminating people sitting with other couples more  
than once.

I've included my work for your info.

John McIntosh


 
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progdin.lp
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