To obtain results in more readable form you can use the printf statement, for example:
...
minimize obj: sum{j in J} used[j];
/* objective is to minimize the number of bins used */
solve;
for {j in J}
{ printf "Items in bin %d:", j;
printf{i in I: x[i,j]} " %d", i;
printf "\n";
}
data;
...
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