Parameters
		----------
		corpus: Corpus for phrase augmentation

		Returns
		-------
		New ParsedCorpus containing unigrams in corpus and new phrases

def add_phrases(self, corpus):
		'''
		Parameters
		----------
		corpus: Corpus for phrase augmentation

		Returns
		-------
		New ParsedCorpus containing unigrams in corpus and new phrases
		'''
		from gensim.models import Phrases

		assert isinstance(corpus, ParsedCorpus)
		self.phrases = [Phrases(CorpusAdapterForGensim.get_sentences(corpus), delimiter=' ')]

		for i in range(1, self.max_tokens_per_phrase):
			self.phrases.append(Phrases(self.phrases[-1][CorpusAdapterForGensim.get_sentences(corpus)]))

		return self