diff --git a/tracking/factorOperations.py b/tracking/factorOperations.py
index e989bf9..e5a44ff 100644
--- a/tracking/factorOperations.py
+++ b/tracking/factorOperations.py
@@ -173,7 +173,23 @@ def eliminateWithCallTracking(callTrackingList=None):
                     "unconditionedVariables: " + str(factor.unconditionedVariables()))
 
         "*** YOUR CODE HERE ***"
-        raiseNotDefined()
+        # print("factor= ", factor)
+        # print("eliminationVariable= ", eliminationVariable)
+        variableDomainsDict=factor.variableDomainsDict()
+        unconditional_variables = [var for var in factor.unconditionedVariables() if var != eliminationVariable]
+        conditioned_variables = factor.conditionedVariables()
+        new_factor = Factor(unconditional_variables, conditioned_variables, variableDomainsDict)
+        cases = new_factor.getAllPossibleAssignmentDicts()
+        for case_ in cases:
+            prob = 0
+            # print("initially, case_= ", case_)
+            for value in variableDomainsDict[eliminationVariable]:
+                case_[eliminationVariable] = value
+                # print("case_= ", case_)
+                prob += factor.getProbability(case_)
+            new_factor.setProbability(case_, prob)
+        # print("new_factor= ", new_factor, " and its cases= ", new_factor.getAllPossibleAssignmentDicts())
+        return new_factor
         "*** END YOUR CODE HERE ***"
 
     return eliminate