Removed some duplicate code from chatbot

Chatbot.py

@@ -264,6 +264,14 @@ class Chatbot(commands.Cog):
 		response = self.getResponseForMessage(wordsToRespondTo)
 		yield from ctx.channel.send(response)
 	
+	# Calculate probabilities and pick a next word from a word pair dict:
+	# https://stackoverflow.com/questions/835092/python-dictionary-are-keys-and-values-always-the-same-order 
+	def pickNextWord(self, pairPossibilities):
+		possible_words = list(pairPossibilities.keys())
+		weights = np.array(list(pairPossibilities.values()))
+		probs = weights / weights.sum()
+		return np.random.choice(possible_words, p=probs)
+	
 	#Respond to a message.
 	#Assumes the message isn't a command
 	@asyncio.coroutine
@@ -315,12 +323,8 @@ class Chatbot(commands.Cog):
 						if word2 in trairPossibilities.keys():
 							pairPossibilities[word2] += trairPossibilities[word2]
 							
-			#Calculate probabilities and pick a next word:
-			#https://stackoverflow.com/questions/835092/python-dictionary-are-keys-and-values-always-the-same-order
-			possible_words = list(pairPossibilities.keys())
-			weights = np.array(list(pairPossibilities.values()))
-			probs = weights / weights.sum()
-			chain.append(np.random.choice(possible_words, p=probs))
+			#Pick a next word:
+			chain.append(self.pickNextWord(pairPossibilities))
 	
 
 		if chain[0] == self.START_OF_MESSAGE:
@@ -375,12 +379,8 @@ class Chatbot(commands.Cog):
 		if len(pairPossibilities) == 0:
 			return False
 		
-		#Calculate probabilities and pick a next word:
-		possible_words = list(pairPossibilities.keys())
-		weights = np.array(list(pairPossibilities.values()))
-		probs = weights / weights.sum()
-		chain.append(np.random.choice(possible_words, p=probs))
-		#TODO this is duplicate code. reuse the stuff from getResponseForMessage()
+		#Pick a next word:
+		chain.append(self.pickNextWord(pairPossibilities))
 		
 		if self.countSyllables(chain[-1]) == nrOfSyl:
 			return chain