Any help will be appreciated

A few suggestions on something that I noticed:

• In the function makechain the else after the return is not necessary.

• This part:

  LETTERS = set(ascii_lowercase)
  VOWELS = set('aeiouy')
  CONSONANTS = LETTERS - VOWELS
  
  BASETAILS = {
      'a': CONSONANTS,
      'b': 'bjlr',
      'c': 'chjklr',
      'd': 'dgjw',
       ....
      }
  
  tails = dict()
  
  for i in ascii_lowercase:
      v = BASETAILS[i]
      if type(v) == set:
          v = ''.join(sorted(v))
      tails.update({i: ''.join(sorted('aeiou' + v))})
  

  seems to do the following:

  1. Create a dictionary with mixed value's type (strings and sets)
  2. Convert all values to string
  3. Sort dictionary's values

  It could be simplified to:

  1. Create a dictionary where all values are strings
  2. Sort dictionary's values

  LETTERS = set(ascii_lowercase)
  VOWELS = set('aeiouy')
  CONSONANTS = ''.join(LETTERS - VOWELS)
  
  BASETAILS = {
      'a': CONSONANTS,
      'b': 'bjlr',
      'c': 'chjklr',
      'd': 'dgjw',
      ....
      }
  
  tails = dict()
  
  for i in ascii_lowercase:
      v = BASETAILS[i]
      tails.update({i: ''.join(sorted('aeiou' + v))})
  

  In this way you also avoid to sort twice.

Any help will be appreciated

A few suggestions on something that I noticed:

• In the function makechain the else after the return is not necessary.

• Typo in: VOWELS = set('aeiouy'), there is an extra y.

• This part:

  LETTERS = set(ascii_lowercase)
  VOWELS = set('aeiou')
  CONSONANTS = LETTERS - VOWELS
  
  BASETAILS = {
      'a': CONSONANTS,
      'b': 'bjlr',
      'c': 'chjklr',
      'd': 'dgjw',
       ....
      }
  
  tails = dict()
  
  for i in ascii_lowercase:
      v = BASETAILS[i]
      if type(v) == set:
          v = ''.join(sorted(v))
      tails.update({i: ''.join(sorted('aeiou' + v))})
  

  seems to do the following:

  1. Create a dictionary with mixed value's type (strings and sets)
  2. Convert all values to string
  3. Sort dictionary's values

  It could be simplified to:

  1. Create a dictionary where all values are strings
  2. Sort dictionary's values

  Additionally, having VOWELS as a set and CONSONANTS as a string is a bit confusing. Would be better to use only one type.

  Code with suggestions above:

  LETTERS = ascii_lowercase
  VOWELS = 'aeiou'
  CONSONANTS = ''.join(set(LETTERS) - set(VOWELS))
  
  BASETAILS = {
      'a': CONSONANTS,
      'b': 'bjlr',
      'c': 'chjklr',
      'd': 'dgjw',
      ....
      }
  
  tails = dict()
  
  for i in ascii_lowercase:
      v = BASETAILS[i]
      tails.update({i: ''.join(sorted(VOWELS + v))})
  

  In this way, you also avoid sorting twice.