The following features are demonstrated in this example:
problem type: mixed integer linear programming
numeric and string index sets
INIT option
NOMISS option
IMPVAR statement
reading multiple data sets
reading dense two-dimensional data
set operator DIFF
IF-THEN/ELSE expression
MOD function
CARD function
.ub
variable suffix
CONSTANT function
fixed cost
modeling if-then constraints by using binary variables
cardinality constraint
declaring an objective in terms of another objective
generic problem symbols _NVAR_ and _VAR_