diff --git a/mathics/core/pattern.py b/mathics/core/pattern.py
index 14a7d8c25..2a17ba7bb 100644
--- a/mathics/core/pattern.py
+++ b/mathics/core/pattern.py
@@ -557,7 +557,7 @@ def match_element(
         if len(element_candidates) < match_count[0]:
             return
 
-        candidates = rest_expression[1]
+        candidates = tuple(rest_expression[1])
 
         # "Artificially" only use more elements than specified for some kind
         # of pattern.
@@ -901,7 +901,7 @@ def expression_pattern_match_element_orderless(
             ):
                 needed = existing.elements
             else:
-                needed = [existing]
+                needed = (existing,)
             available = list(candidates)
             for needed_element in needed:
                 if (
@@ -911,7 +911,15 @@ def expression_pattern_match_element_orderless(
                     available.remove(needed_element)
                 else:
                     return set()
-            sets = [(needed, ([], available))]
+            sets = [
+                (
+                    needed,
+                    (
+                        [],
+                        available,
+                    ),
+                )
+            ]
 
     if sets is None:
         sets = subsets(
@@ -920,7 +928,7 @@ def expression_pattern_match_element_orderless(
             less_first=less_first,
             *set_lengths,
         )
-    return sets
+    return tuple(((tuple(q) for q in s) for s in sets))
 
 
 def expression_pattern_match_element_process_items(
diff --git a/mathics/doc/latex/mathics-title.pdf b/mathics/doc/latex/mathics-title.pdf
deleted file mode 100644
index 996fb5c97..000000000
Binary files a/mathics/doc/latex/mathics-title.pdf and /dev/null differ