diff --git a/languedoc.py b/languedoc.py
--- a/languedoc.py
+++ b/languedoc.py
@@ -46,24 +46,21 @@ def merge_ngram_freqs(freqs):
 class Sample:
 	def __init__(self, language="??", text=""):
 		self.language = language
-		self.frequencies = [dict(), dict(), dict()]
+		self.frequencies = dict()
 
 		if text:
 			self._extract(text)
 
 	def _extract(self, text):
 		for k in range(1, 4):
-			self.frequencies[k-1] = extract_ngram_freqs(text, k)
+			self.frequencies.update(extract_ngram_freqs(text, k))
 
 	@staticmethod
 	def merge(samples):
 		assert len({x.language for x in samples}) == 1
 
 		res = Sample(samples[0].language)
-		res.frequencies = []
-
-		for freqs in zip(*(x.frequencies for x in samples)):
-			res.frequencies.append(merge_ngram_freqs(freqs))
+		res.frequencies = merge_ngram_freqs([x.frequencies for x in samples])
 
 		return res
 
@@ -72,16 +69,13 @@ class Sample:
 		use frequencies x order
 		use letter, digrams, trigrams
 		use absolute x square"""
-		own_frequencies = self.frequencies[0] | self.frequencies[1] | self.frequencies[2]
-		other_frequencies = other.frequencies[0] | other.frequencies[1] | other.frequencies[2]
+		ordered_own_ngrams = sorted(self.frequencies.items(), key=lambda kv: -kv[1])[:TOP_NGRAM_COUNT]
+		ordered_other_ngrams = sorted(other.frequencies.items(), key=lambda kv: -kv[1])[:TOP_NGRAM_COUNT]
+		ranked_own_ngrams = dict(zip([key for (key, freq) in ordered_own_ngrams], itertools.count(0)))
+		ranked_other_ngrams = dict(zip([key for (key, freq) in ordered_other_ngrams], itertools.count(0)))
 
-		ordered_own_trigrams = sorted(own_frequencies.items(), key=lambda kv: -kv[1])[:TOP_NGRAM_COUNT]
-		ordered_other_trigrams = sorted(other_frequencies.items(), key=lambda kv: -kv[1])[:TOP_NGRAM_COUNT]
-		ranked_own_trigrams = dict(zip([key for (key, freq) in ordered_own_trigrams], itertools.count(0)))
-		ranked_other_trigrams = dict(zip([key for (key, freq) in ordered_other_trigrams], itertools.count(0)))
-
-		res = sum(abs(v-ranked_other_trigrams.get(k, TOP_NGRAM_COUNT)) for (k, v) in ranked_own_trigrams.items()) + \
-					sum(abs(v-ranked_own_trigrams.get(k, TOP_NGRAM_COUNT)) for (k, v) in ranked_other_trigrams.items())
+		res = sum(abs(v-ranked_other_ngrams.get(k, TOP_NGRAM_COUNT)) for (k, v) in ranked_own_ngrams.items()) + \
+					sum(abs(v-ranked_own_ngrams.get(k, TOP_NGRAM_COUNT)) for (k, v) in ranked_other_ngrams.items())
 
 		return res