diff --git a/cre/fact.py b/cre/fact.py
index 5d27a9f..9521583 100644
--- a/cre/fact.py
+++ b/cre/fact.py
@@ -368,7 +368,7 @@ def _standardize_conversions(conversions, attr_type, context):
     stand_conv = {}
     for conv_type, conv_op in conversions.items():
         conv_type = _standardize_type(conv_type, context)
-        print(attr_type)
+        # print(attr_type)
         if(isinstance(conv_op, UntypedCREFunc)): conv_op = conv_op(attr_type)
         assert conv_op.return_type == conv_type, f"{conv_op} does not return conversion type {conv_type}."
         stand_conv[conv_type] = conv_op
diff --git a/cre/memset.py b/cre/memset.py
index 5f1dc36..ccb7589 100644
--- a/cre/memset.py
+++ b/cre/memset.py
@@ -955,7 +955,7 @@ def ctor():
 '''
             source_to_cache('MemSetIndexer', long_hash, source)
         ctor = import_from_cached('MemSetIndexer', long_hash, ['ctor'])['ctor']
-        print(ctor)
+        # print(ctor)
         _indexer_ctor_impls[tup] = ctor
     return _indexer_ctor_impls[tup]
 
diff --git a/cre/transform/memset_builder.py b/cre/transform/memset_builder.py
index de98587..4eff9bf 100644
--- a/cre/transform/memset_builder.py
+++ b/cre/transform/memset_builder.py
@@ -1,3 +1,4 @@
+from numba.typed import List
 from cre.context import cre_context
 from cre.memset import MemSet
 
@@ -43,9 +44,19 @@ def tranform(self, state_dict, out_memset=None, return_map=False):
                 if(attr not in config): continue
                 val_name = config[attr]
                 if(not val_name): continue # i.e. skip if None or empty str
-                if(val_name not in fact_instances):
-                    raise ValueError(f"Reference to unspecified fact {val_name}.")
-                setattr(fact, attr, fact_instances[val_name])
+
+                if isinstance(val_name, list):
+                    fact_list = []
+                    for elem_val_name in val_name:
+                        if(not elem_val_name): continue # i.e. skip if None or empty str
+                        if(elem_val_name not in fact_instances):
+                            raise ValueError(f"Reference to unspecified fact {elem_val_name} in {val_name}.")
+                        fact_list.append(fact_instances[elem_val_name])
+                    setattr(fact, attr, List(fact_list))
+                else:
+                    if(val_name not in fact_instances):
+                        raise ValueError(f"Reference to unspecified fact {val_name}.")
+                    setattr(fact, attr, fact_instances[val_name])
 
         # Declare each fact to a new MemSet
         if(out_memset is None):