Removed duality from the Sentence class.

umbra/anchor_algorithm.py

@@ -43,6 +43,8 @@ class AnchorAlgorithm(AlignmentStrategy):
                                                  shd_index)
                 shd_last_anchor = self._shadow.index(word.anchor) + 1
                 src_last_anchor = src_index + 1
+            elif src_index == len(self._source):
+                print("TESTESTSETSET")
 
     def _search_between_anchors(self, src_start, shd_start, src_end, shd_end):
         """Search for shadowed words between two anchored pairs of words.

umbra/mistake_finder.py

@@ -18,7 +18,7 @@ class MistakeFinder:
             if not word.correct:
                 self._determine_mistake(index, word)
         # Loop over the source:
-        for word in source:
+        for word in self.source:
             if not word.shadowed and word.mistake is None:
                 # If not yet marked as mistake, then it is skipped:
                 word.mistake = Mistake.SKIPPED
@@ -31,7 +31,7 @@ class MistakeFinder:
                     word.mistake = Mistake.RANDOM
 
     def _check_repetition(self, word, index):
-        raise
+        assert 0 <= index < len(self.shadow)
 
     # TODO: WordNet integration. Function below should be usable already!
     # def _check_semantic_mistake(self, shd_word):

umbra/words.py

@@ -200,14 +200,4 @@ class SourceWord(Word):
 
 class Sentence(list):
     def __init__(self, words):
-        list.__init__(self, words)
-        self.words = words  # I am not sure if this is the 'proper' fix
-
-    def __str__(self):
-        return " ".join([str(w) for w in self.words])
-
-    def __len__(self):
-        return len(self.words)
-
-    def __iter__(self):
-        return iter(self.words)
+        super().__init__(words)