diff --git a/packages/CLPBN/examples/learning/debug_school.yap b/packages/CLPBN/examples/learning/debug_school.yap
index 907efc802..620da155d 100644
--- a/packages/CLPBN/examples/learning/debug_school.yap
+++ b/packages/CLPBN/examples/learning/debug_school.yap
@@ -8,7 +8,7 @@
 
 :- ['../../examples/School/parschema.pfl'].
 
-:- set_em_solver(ve).
+%:- set_em_solver(ve).
 %:- set_em_solver(hve).
 %:- set_em_solver(bdd).
 %:- set_em_solver(bp).
diff --git a/packages/CLPBN/examples/learning/prof_params.pfl b/packages/CLPBN/examples/learning/prof_params.pfl
index 32df5081b..313e64b80 100644
--- a/packages/CLPBN/examples/learning/prof_params.pfl
+++ b/packages/CLPBN/examples/learning/prof_params.pfl
@@ -4,7 +4,7 @@
 
 :- use_module(library(clpbn/learning/em)).
 
-:- set_em_solver(ve).
+%:- set_em_solver(ve).
 %:- set_em_solver(hve).
 %:- set_em_solver(bdd).
 %:- set_em_solver(bp).
diff --git a/packages/CLPBN/examples/learning/school_params.yap b/packages/CLPBN/examples/learning/school_params.yap
index fd93edb27..9661e3102 100644
--- a/packages/CLPBN/examples/learning/school_params.yap
+++ b/packages/CLPBN/examples/learning/school_params.yap
@@ -8,7 +8,7 @@
 
 :- ['../../examples/School/school_32'].
 
-:- set_em_solver(ve).
+%:- set_em_solver(ve).
 %:- set_em_solver(hve).
 %:- set_em_solver(bdd).
 %:- set_em_solver(bp).