diff --git a/packages/ProbLog/problog_examples/learn_graph_lbdd.pl b/packages/ProbLog/problog_examples/learn_graph_lbdd.pl
index b0be6bf7d..b495c9b17 100644
--- a/packages/ProbLog/problog_examples/learn_graph_lbdd.pl
+++ b/packages/ProbLog/problog_examples/learn_graph_lbdd.pl
@@ -14,7 +14,7 @@
 % will run 20 iterations of learning with default settings
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-:- use_module(library(problog_lbdd)).
+:- use_module(library(problog)).
 :- use_module(library(problog_learning_lbdd)).
 
 %%%%
diff --git a/packages/ProbLog/problog_learning.yap b/packages/ProbLog/problog_learning.yap
index 476e17e4b..ea5c42add 100644
--- a/packages/ProbLog/problog_learning.yap
+++ b/packages/ProbLog/problog_learning.yap
@@ -1,4 +1,4 @@
-%%% -*- Mode: Prolog; -*-
+1%%% -*- Mode: Prolog; -*-
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
@@ -246,14 +246,17 @@
 :- dynamic(query_md5/3).
 
 :- multifile(user:example/4).
+:- multifile(user:problog_drop_example/1).
 user:example(A,B,C,=) :-
 	current_predicate(user:example/3),
-	user:example(A,B,C).
+	user:example(A,B,C),
+	\+  user:problog_drop_example(B).
 
 :- multifile(user:test_example/4).
 user:test_example(A,B,C,=) :-
 	current_predicate(user:test_example/3),
-	user:test_example(A,B,C).
+	user:test_example(A,B,C),
+	\+  user:problog_drop_example(B).
 
 
 %========================================================================
@@ -514,7 +517,7 @@ init_learning :-
 	->
 	 (
 	  format_learning(2,'Theory uses continuous facts.~nWill use problog_exact/3 as initalization method.~2n',[]),
-	  set_problog_flag(init_method,(Query,Probability,BDDFile,ProbFile,problog_exact_save(Query,Probability,_Status,BDDFile,ProbFile)))
+	  set_problog_flag(init_method,(Query,Probability,BDDFile,ProbFile,problog:problog_exact_save(Query,Probability,_Status,BDDFile,ProbFile)))
 	 );
 	 true
 	),
@@ -524,7 +527,7 @@ init_learning :-
 	->
 	 (
 	  format_learning(2,'Theory uses tabling.~nWill use problog_exact/3 as initalization method.~2n',[]),
-	  set_problog_flag(init_method,(Query,Probability,BDDFile,ProbFile,problog_exact_save(Query,Probability,_Status,BDDFile,ProbFile)))
+	  set_problog_flag(init_method,(Query,Probability,BDDFile,ProbFile,problog:problog_exact_save(Query,Probability,_Status,BDDFile,ProbFile)))
 	 );
 	 true
 	),
diff --git a/packages/ProbLog/problog_learning_lbdd.yap b/packages/ProbLog/problog_learning_lbdd.yap
index 3e36b6bba..f31333bc6 100644
--- a/packages/ProbLog/problog_learning_lbdd.yap
+++ b/packages/ProbLog/problog_learning_lbdd.yap
@@ -243,19 +243,27 @@
 :- dynamic(query_md5/2).
 
 
+% used to identify queries which have identical proofs
+:- dynamic(query_is_similar/2).
+:- dynamic(query_md5/3).
+
 % used to identify queries which have identical proofs
 :- dynamic(query_is_similar/2).
 :- dynamic(query_md5/3).
 
 :- multifile(user:example/4).
+:- multifile(user:problog_discard_example/1).
 user:example(A,B,C,=) :-
 	current_predicate(user:example/3),
-	user:example(A,B,C).
+	user:example(A,B,C),
+	\+  user:problog_discard_example(B).
 
 :- multifile(user:test_example/4).
 user:test_example(A,B,C,=) :-
 	current_predicate(user:test_example/3),
-	user:test_example(A,B,C).
+	user:test_example(A,B,C),
+	\+  user:problog_discard_example(B).
+
 
 
 %========================================================================
@@ -604,7 +612,7 @@ bdd_input_file(Filename) :-
 	concat_path_with_filename(Dir,'input.txt',Filename).
 
 init_one_query(QueryID,Query,Type) :-
-	format_learning(3,' ~q example ~q: ~q~n',[Type,QueryID,Query]),
+%	format_learning(3,' ~q example ~q: ~q~n',[Type,QueryID,Query]),
 
         %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 	% if BDD file does not exist, call ProbLog
@@ -614,18 +622,19 @@ init_one_query(QueryID,Query,Type) :-
 	->
 	 format_learning(3,' Reuse existing BDD ~q~n~n',[QueryID]);
 	 (
+	  b_setval(problog_required_keep_ground_ids,false),
 	  problog_flag(libbdd_init_method,(Query,Bdd,Call)),
 	  Bdd = bdd(Dir, Tree, MapList),
+%	  trace,
 	  once(Call),
 	  rb_new(H0),
 	  maplist_to_hash(MapList, H0, Hash),
-	%  writeln(Dir:Tree:MapList),
+	  Tree \= [],
+%	  writeln(Dir:Tree:MapList),
 	  tree_to_grad(Tree, Hash, [], Grad),
-%% %writeln(Call:Tree),
-	  recordz(QueryID,bdd(Dir, Grad, MapList),_)
+	 recordz(QueryID,bdd(Dir, Grad, MapList),_)
 	 )
 	),
-    
         %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 	% check wether this BDD is similar to another BDD
 	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -636,7 +645,7 @@ init_one_query(QueryID,Query,Type) :-
         ;
 	 true
 	),!.
-
+init_one_query(_QueryID,_Query,_Type).
 
 
 
diff --git a/packages/bdd/trie_sp.yap b/packages/bdd/trie_sp.yap
index 4ca2c727e..ba9106690 100644
--- a/packages/bdd/trie_sp.yap
+++ b/packages/bdd/trie_sp.yap
@@ -44,8 +44,13 @@ complex_to_andor([Els], Map0, MapF, V) :-
 
 complex_to_and(int(A1,[endlist]), Map0, MapF, V) :- !,
 	check(Map0, A1, V, MapF).
+complex_to_and(atom(A1,[endlist]), Map0, MapF, V) :- !,
+	check(Map0, A1, V, MapF).
 complex_to_and(functor(not,1,[int(A1,[endlist])]), Map0, MapF, not(V)) :- !,
 	check(Map0, A1, V, MapF).
+complex_to_and(atom(A1,Els), Map0, MapF, and(V,T2)) :-  !,
+	check(Map0, A1, V, MapI),
+	complex_to_andor(Els, MapI, MapF, T2).
 complex_to_and(int(A1,Els), Map0, MapF, and(V,T2)) :-  !,
 	check(Map0, A1, V, MapI),
 	complex_to_andor(Els, MapI, MapF, T2).
@@ -79,6 +84,8 @@ tabled_complex_to_andor([Els], Map0, MapF, Tab0, TabF, V) :-
 
 tabled_complex_to_and(int(A1,[endlist]), Map0, MapF, Tab, Tab, V) :- !,
 	check(Map0, A1, V, MapF).
+tabled_complex_to_and(atom(A1,[endlist]), Map0, MapF, Tab, Tab, V) :- !,
+	check(Map0, A1, V, MapF).
 tabled_complex_to_and(functor(not,1,[int(A1,[endlist])]), Map0, MapF, Tab, Tab, not(V)) :- !,
 	check(Map0, A1, V, MapF).
 tabled_complex_to_and(T, Map, Map, Tab, Tab, V) :-