Say NO to duplicated output

polymani.pl

@@ -76,20 +76,11 @@ polyplay :-
                     cons(H, _, NC),
                     write(H),
                     nl
-        ;
-        (
-            %% If the debug_print flag is true, print some extract debug info
-            debug_print(true),
-            write(LA),
-            nl,
-            write(TIn),
-            nl
                 ;
                     %% Otherwise, process the parse tree and execute the commands within
                     process_input(TIn)
                 )
             )
-        )
         ;
         %% Parsing failed
             writeln("I didn't understand what you want.")
@@ -99,13 +90,13 @@ polyplay :-
     ),
 !.
 
-%% Flag which determines whether to print the parsed input or to process it
-debug_print(false).
-
-%% process_input(+tree) is determines
+%% process_input(+Tree) is det
 %
 %  Execute the commands from the parse tree
 %
+process_input(command(CL, void)) :-
+    %% Process only command left
+    do_process_input(CL).
 process_input(command(CL, TCR)) :-
     %% Process first command
     do_process_input(CL),
@@ -113,11 +104,8 @@ process_input(command(CL, TCR)) :-
     TCR \== void,
     %% recurse
     process_input(TCR).
-process_input(command(CL, void)) :-
-    %% Process only command left
-    do_process_input(CL).
 
-%% do_process_input(+tree) is det
+%% do_process_input(+Tree) is det
 %
 %  Process a single command from the input
 %  Takes, as the only argument, the tree representing