readable output. ok im done

metro.pl

@@ -5,12 +5,23 @@
 % https://www.swi-prolog.org/pldoc/man?section=clpfd
 :- use_module(library(clpfd)).
 
-go :- solution(Vars), labeling([ff], Vars), write(Vars).
+go :-
+  solution(Vars), labeling([ff], Vars),
+  add_names(Vars, NVs), keysort(NVs, SNVs), group_pairs_by_key(SNVs, Groups),
+  maplist(writeln, Groups).
 
 solution_count(N) :-
   setof(Vars, (solution(Vars), labeling([ff], Vars)), Res),
   length(Res, N).
 
+add_names(Vals, Named) :-
+  Names = [nineteen, twentyone, twentyfive, thirty, thirtyeight,
+           collision, explosion, kidnapping, robbery, vandalism,
+           hat, jacket, sunglasses, tie, turtleneck,
+           bat, brokenbottle, gun, knife, sword,
+           phone, purse, suitcase, violin, watch],
+  pairs_keys_values(Named, Vals, Names).
+
 solution(Vars) :-
   Vars = [Nineteen, Twentyone, Twentyfive, Thirty, Thirtyeight,
           Collision, Explosion, Kidnapping, Robbery, Vandalism,