Verify that the assignment problem, the transportation problem, and the transshipment problem are all special cases of this MCNF class. Hint: To solve this exercise, see how you need to defne bi for each node and verify that the MCNF formulation $($after defning bi$)$ gives you an identical formulation to those already described above for the assignment, transportation, and transshipment problems. E Important For a MCNF to be feasible, total supply must equal total demand. In other words $$i in v bi $=0.$