diff --git a/reactor/Core/src/jetbrains/mps/logic/reactor/program/Program.java b/reactor/Core/src/jetbrains/mps/logic/reactor/program/Program.java
index f9e34248..4dba00de 100644
--- a/reactor/Core/src/jetbrains/mps/logic/reactor/program/Program.java
+++ b/reactor/Core/src/jetbrains/mps/logic/reactor/program/Program.java
@@ -16,9 +16,11 @@
 
 package jetbrains.mps.logic.reactor.program;
 
+import javaslang.collection.Stream;
 import jetbrains.mps.logic.reactor.core.RulesDiff;
 
 import java.util.ArrayList;
+import java.util.stream.Collectors;
 
 /**
  * A collection of rulesLists that constitute a constraint rules program.
@@ -29,11 +31,11 @@ public abstract class Program {
 
     public abstract String name();
 
+    @Deprecated
     public abstract Iterable<RulesList> rulesLists();
 
     public abstract PreambleInfo preambleInfo();
 
-
     public Program withRulesDiff(RulesDiff diff) { return this; };
 
     public RulesDiff incrementalDiff() { return RulesDiff.emptyDiff(); };
diff --git a/reactor/Core/src/jetbrains/mps/logic/reactor/program/RulesList.java b/reactor/Core/src/jetbrains/mps/logic/reactor/program/RulesList.java
index c2169f3f..b32db766 100644
--- a/reactor/Core/src/jetbrains/mps/logic/reactor/program/RulesList.java
+++ b/reactor/Core/src/jetbrains/mps/logic/reactor/program/RulesList.java
@@ -18,9 +18,9 @@ package jetbrains.mps.logic.reactor.program;
 
 /**
  * A container for rules.
- * 
  * @author Fedor Isakov
  */
+@Deprecated
 public abstract class RulesList {
 
     public abstract String name();