$onEmpty

Set i(*) |_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________| /
'seattle' |_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________|, 
'san-diego' |_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________| /;

Set j(*) |_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________| /
'new-york' |_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________|, 
'chicago' |_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________|, 
'topeka' |_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________| /;

Parameter d(i,j) |_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________| /
'seattle'.'new-york' 2.5, 
'seattle'.'chicago' 1.7, 
'seattle'.'topeka' 1.8, 
'san-diego'.'new-york' 2.5, 
'san-diego'.'chicago' 1.8, 
'san-diego'.'topeka' 1.4 /;

$offEmpty
