diff --git a/shared.py b/shared.py
--- a/shared.py
+++ b/shared.py
@@ -1,9 +1,15 @@
+import re
 import itertools
 
 TOP_NGRAM_COUNT = 5000
 
 
-def extract_ngram_freqs(text, k):
+def preprocess(text):
+	text = re.sub(r"[\W\d_]+", " ", " "+text+" ")
+	return text.lower()
+
+
+def extract_kgram_freqs(text, k):
 	n = len(text)
 	d = dict()
 
@@ -19,26 +25,44 @@ def extract_ngram_freqs(text, k):
 	return {key: val/count for (key, val) in d.items()}
 
 
-class Sample:
-	def __init__(self, language="??", text=""):
-		self.language = language
-		self.frequencies = dict()
-		self._ranked_ngrams = dict()
+def extract_ngram_freqs(text):
+	frequencies = {}
+
+	for k in range(1, 4):
+		frequencies.update(extract_kgram_freqs(text, k))
+
+	return frequencies
+
 
-		if text:
-			self._extract(text)
+def rank_ngram_freqs(frequencies):
+	ordered_ngrams = sorted(frequencies.items(), key=lambda kv: -kv[1])[:TOP_NGRAM_COUNT]
+	return dict(zip([key for (key, freq) in ordered_ngrams], itertools.count(0)))
+
+
+def extract_ranked_ngrams(text):
+	frequencies = extract_ngram_freqs(text)
+	return rank_ngram_freqs(frequencies)
+
 
-	def _extract(self, text):
-		for k in range(1, 4):
-			self.frequencies.update(extract_ngram_freqs(text, k))
+class Sample:
+	def __init__(self, language, ranked_ngrams):
+		self.language = language
+		self.ranked_ngrams = ranked_ngrams
+
+	@classmethod
+	def extract(cls, text, language="??"):
+		return cls(language, extract_ranked_ngrams(preprocess(text)))
 
-	@property
-	def ranked_ngrams(self):
-		if not self._ranked_ngrams:
-			ordered_ngrams = sorted(self.frequencies.items(), key=lambda kv: -kv[1])[:TOP_NGRAM_COUNT]
-			self._ranked_ngrams = dict(zip([key for (key, freq) in ordered_ngrams], itertools.count(0)))
+	@classmethod
+	def load(cls, exported):
+		ranked_ngrams = {key: order for (order, key) in enumerate(exported["ngrams"])}
+		return cls(exported["language"], ranked_ngrams)
 
-		return self._ranked_ngrams
+	def export(self):
+		return {
+			"language": self.language,
+			"ngrams": [key for (key, order) in sorted(self.ranked_ngrams.items(), key=lambda key_order: key_order[1])]
+		}
 
 	def compare(self, other):
 		"""take k most common
@@ -51,20 +75,8 @@ class Sample:
 
 		return res
 
-	def print_overview(self):
-		print(f"Sample({self.language}):")
-
-		for freqs in self.frequencies:
-			x = [
-				(k, round(v, 3))
-				for (k, v) in sorted(freqs.items(), key=lambda kv: -kv[1])
-			]
-			print("  ", x[:8], "...", x[-8:])
-
-		print()
-
 
 def identify(text, models):
-	sample = Sample(text=text)
+	sample = Sample.extract(text)
 
 	return sorted(models, key=lambda m: m.compare(sample))[0].language