Three suppliers $($S$\_(1),$S$\_(2),$S$\_(3))$ are used to provide four customers $($T$\_(1),$T$\_(2),$T$\_(3),$T$\_(4))$ with their requirements for a particular commodity over a year. The yearly capacities of the suppliers and requirements of the customers are given below $($in suitable units$)[[$Suppliers$,$S$\_(1),$S$\_(2),$S$\_(3),],[$Capacities $($per year$),135,56,93,],[$Customers$,$T$\_(1),$T$\_(2),$T$\_(3),$T$\_(4)$