The following practice problem has been generated for you:
Determine each cross-partition for:
[{11,12},{19,17,4},{15,1,20}][{11,12},{19,17,4},{15,1,20},{11,15,10},{17,4},{16,18,8}][{11,12},{19,17,4},{15,1,20},{11,15,10},{17,4},{16,18,8},{7,20,11},{14,8}]