D 1
D 2
D 3
D 4
Capacity
S 1
a 11
a 12
a 13
a 14
a 1
S 2
a 21
a 22
a 23
a 24
a 2
S 3
a 31
a 32
a 33
a 34
a 3
Demand
b 1
b 2
b 3
b 4