The following data sets and macro variables contain the input data that are used in this example:

data dept_data;
   input dept $ @@;
   datalines;
A B C D E
;

data city_data;
   input city $;
   datalines;
Bristol
Brighton
London
;

data benefit_data;
   input city $ A B C D E;
   datalines;
Bristol  10 15 10 20  5
Brighton 10 20 15 15 15
;

data comm_data;
   input i $ j $ comm;
   datalines;
A B 0.0
A C 1.0
A D 1.5
A E 0.0
B C 1.4
B D 1.2
B E 0.0
C D 0.0
C E 2.0
D E 0.7
;

data cost_data;
   input i $ j $ cost;
   datalines;
Bristol  Bristol   5
Bristol  Brighton 14
Bristol  London   13
Brighton Brighton  5
Brighton London    9
London   London   10
;

%let max_num_depts = 3;