The following features are demonstrated in this example:
problem type: linear programming
numeric and string index sets
reading dense two-dimensional data
reading sparse two-dimensional data
sets of tuples
bounds in the VAR statement
.ub variable suffix
FIX statement
using a colon (:) to select members of a set
set operator DIFF
SLICE expression
implicit slice
multiple objectives and the OBJ option
multiple input and output data sets