code: def lengthen(self):
  		'''
  		Returns a new Vowel with its Length lengthened, 
  		and ":" appended to its IPA symbol.
  		'''
  		vowel = deepcopy(self)
  
  		if vowel[Length] == Length.short:
  			vowel[Length] = Length.long
  		elif vowel[Length] == Length.long:
  			vowel[Length] = Length.overlong
  
  		vowel.ipa += ':'
  		return vowef lengthen(self):
  		'''
  		Returns a new Vowel with its Length lengthened, 
  		and ":" appended to its IPA symbol.
  		'''
  		vowel = deepcopy(self)
  
  		if vowel[Length] == Length.short:
  			vowel[Length] = Length.long
  		elif vowel[Length] == Length.long:
  			vowel[Length] = Length.overlong
  
  		vowel.ipa += ':'
  		return vowel
docs: Returns a new Vowel with its Length lengthened, 
  		and ":" appended to its IPA symbol.