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sum(link(i,j):x(i,j))=1);
sum(link(i,j):x(i,j))<1);
bin(x(i,j)));
sum(set1(i):x(i,j))>=1);
sum(set1(i):x(i,j))<=2);
sum(set2(j):x(i,j))>=0);
sum(set2(j):x(i,j))<=4);
sum(link(i,j) | i #le# @size(set1):x(i,j)))=8;
sum(person(j):x(i,j))>=1);
sum(person(j):x(i,j))<=2);
sum(post(i):x(i,j))<=1);
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