+import org.simantics.structural.synchronization.utils.ComponentBase;
+import org.simantics.structural.synchronization.utils.ComponentFactory;
+import org.simantics.structural.synchronization.utils.MappingBase;
+import org.simantics.structural.synchronization.utils.Solver;
+import org.slf4j.Logger;
+
+import gnu.trove.map.hash.THashMap;
+import gnu.trove.set.hash.THashSet;