Determine distrinct matches for one colocation id.

wani.py

@@ -1112,6 +1112,13 @@ class StructureMatch:
         self.matches = []
         self.representations = {}
     
+    def distinct_matches(self):
+        dm = set()
+        keys = list(self.matches[0].keys())
+        for words in self.matches:
+            dm.add(" ".join(words[k].text for k in keys))
+        return len(dm)
+
     def append(self, match):
         self.matches.append(match)