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%g = ( Chicago => { Cleveland=>400 },
       Cleveland => { Chicago=>400 } );

my %g = ( Chicago=>{ Detroit=>250,
                     Cleveland=>400,
...
d( \%g, 'Denver', 'Cleveland' ); # should be ( 'Denver', 'Chicago', 'C
+leveland' )
d( \%g, 'Cleveland', 'Denver' ); # should be 
( 'Cleveland', 'Chicago', 'Denver' );