diff --git a/fast-aligner/Makefile b/fast-aligner/Makefile
index 6e2cf9f..ba425c7 100644
--- a/fast-aligner/Makefile
+++ b/fast-aligner/Makefile
@@ -1,6 +1,6 @@
 SRC_LANG=pl
 TRG_LANG=en
-CORPUS_NAME=opensubtitles
+CORPUS_NAME=opensubtitles_sample
 SEPARATOR=@\#@
 
 DICTIONARY_WEIGHT=3
@@ -38,7 +38,7 @@ corpora/$(CORPUS_NAME)/trg.lem: corpora/$(CORPUS_NAME)/trg.txt
 
 
 corpora/$(CORPUS_NAME)/src_clean.txt corpora/$(CORPUS_NAME)/src_clean.lem corpora/$(CORPUS_NAME)/trg_clean.txt corpora/$(CORPUS_NAME)/ids_clean.txt corpora/$(CORPUS_NAME)/falign_corpus.txt: corpora/$(CORPUS_NAME)/src.txt corpora/$(CORPUS_NAME)/trg.txt corpora/$(CORPUS_NAME)/ids.txt corpora/$(CORPUS_NAME)/src.lem corpora/$(CORPUS_NAME)/trg.lem corpora/$(CORPUS_NAME)/src.dict corpora/$(CORPUS_NAME)/trg.dict
-	./prepare_corpus.py corpora/$(CORPUS_NAME)/src.txt corpora/$(CORPUS_NAME)/trg.txt corpora/$(CORPUS_NAME)/ids.txt corpora/$(CORPUS_NAME)/src.lem corpora/$(CORPUS_NAME)/trg.lem corpora/$(CORPUS_NAME)/src.dict corpora/$(CORPUS_NAME)/trg.dict corpora/$(CORPUS_NAME)/src_clean.txt corpora/$(CORPUS_NAME)/src_clean.lem corpora/$(CORPUS_NAME)/trg_clean.txt corpora/$(CORPUS_NAME)/ids_clean.txt corpora/$(CORPUS_NAME)/falign_corpus.txt
+	./prepare_corpus.py corpora/$(CORPUS_NAME)/src.txt corpora/$(CORPUS_NAME)/trg.txt corpora/$(CORPUS_NAME)/ids.txt corpora/$(CORPUS_NAME)/src.lem corpora/$(CORPUS_NAME)/trg.lem corpora/$(CORPUS_NAME)/src.dict corpora/$(CORPUS_NAME)/trg.dict corpora/$(CORPUS_NAME)/src_clean.txt corpora/$(CORPUS_NAME)/src_clean.lem corpora/$(CORPUS_NAME)/trg_clean.txt corpora/$(CORPUS_NAME)/ids_clean.txt corpora/$(CORPUS_NAME)/falign_corpus.txt $(SRC_LANG) $(TRG_LANG)
 
 
 corpora/$(CORPUS_NAME)/falign_result.txt: corpora/$(CORPUS_NAME)/falign_corpus.txt 
diff --git a/fast-aligner/prepare_corpus.py b/fast-aligner/prepare_corpus.py
index 1853067..c72a093 100755
--- a/fast-aligner/prepare_corpus.py
+++ b/fast-aligner/prepare_corpus.py
@@ -1,12 +1,40 @@
 #!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
-import sys
+import sys, re, os
+
+
+def readProfanityPattern(lang):
+    result = None
+    file_path = 'bad-words/%s.txt' % lang
+    if os.path.isfile(file_path):
+        raw_pattern = r'\b('
+        with open(file_path) as profanity_file:
+            for line in profanity_file:
+                raw_pattern += line.rstrip() + "|"
+        raw_pattern = raw_pattern[:-1] + r')\b'
+        result = re.compile(raw_pattern)
+    return result
+
+def containsProfanity(pattern, sentence):
+    if pattern is None:
+        return False
+    else:
+        m = re.search(pattern, sentence)
+        if m:
+            #sys.stderr.write('Found profanity in sentence: %s\n' % sentence)
+            return True
+        else:
+            return False
 
 max_tokens = 100
 max_ratio = 4.0
 
-#./prepare_corpus.py corpora/$(CORPUS_NAME)/src.txt corpora/$(CORPUS_NAME)/trg.txt corpora/$(CORPUS_NAME)/ids.txt corpora/$(CORPUS_NAME)/src.lem corpora/$(CORPUS_NAME)/trg.lem corpora/$(CORPUS_NAME)/src.dict corpora/$(CORPUS_NAME)/trg.dict corpora/$(CORPUS_NAME)/src_clean.txt corpora/$(CORPUS_NAME)/src_clean.lem corpora/$(CORPUS_NAME)/trg_clean.txt corpora/$(CORPUS_NAME)/ids_clean.txt corpora/$(CORPUS_NAME)/falign_corpus.txt
+#./prepare_corpus.py corpora/$(CORPUS_NAME)/src.txt corpora/$(CORPUS_NAME)/trg.txt corpora/$(CORPUS_NAME)/ids.txt corpora/$(CORPUS_NAME)/src.lem corpora/$(CORPUS_NAME)/trg.lem corpora/$(CORPUS_NAME)/src.dict corpora/$(CORPUS_NAME)/trg.dict corpora/$(CORPUS_NAME)/src_clean.txt corpora/$(CORPUS_NAME)/src_clean.lem corpora/$(CORPUS_NAME)/trg_clean.txt corpora/$(CORPUS_NAME)/ids_clean.txt corpora/$(CORPUS_NAME)/falign_corpus.txt $SRC_LANG $TRG_LANG
+
+src_profanity_pattern = readProfanityPattern(sys.argv[13])
+trg_profanity_pattern = readProfanityPattern(sys.argv[14])
+
 
 
 
@@ -22,7 +50,7 @@ with open(sys.argv[1]) as src, open(sys.argv[2]) as trg, open(sys.argv[3]) as id
         trg_token_count = len(trg_line_lem.split())
         if (src_token_count > 0 and trg_token_count > 0 and src_token_count <= max_tokens and trg_token_count <= max_tokens):
             ratio = float(src_token_count/trg_token_count) if src_token_count > trg_token_count else float(trg_token_count/src_token_count)
-            if (ratio <= max_ratio):
+            if (ratio <= max_ratio and (not containsProfanity(src_profanity_pattern, src_line_lem)) and (not containsProfanity(trg_profanity_pattern, trg_line_lem))):
                 src_clean.write(src_line_orig+"\n")
                 src_clean_lem.write(src_line_lem+"\n")
                 trg_clean.write(trg_line_orig+"\n")