Formulate a minimum cost flow model for the problem to minimize the shipping costs while meeting the demand.

a courier service wants to deliver some cargo from its multiple collection centers to some cities using different flights. However, each flight has both a minimum and a maximum space requirement. Below network shows the location of the collection centers and the cargo quantities that need to be shipped, cities where the cargo should be delivered with the quantities, the cost, and the lower and upper limits on the cargo space available on the flights (shown on arcs). Formulate a minimum cost flow model for the above problem to minimize the shipping costs while meeting the demand. 6 (0,6, S1) (1,8, $1) (0,3, 54) (0.4, $2) (1,5, 56)