docs: def get_sequences(input_seqs):
      """Returns a list of Sequences
  
      Parameters
      ----------
      input_seqs : iterable of (str, str)
          The list of input sequences in (label, sequence) format
  
      Returns
      -------
      list of Sequence
  
      Raises
      ------
      ValueError
          If no sequences where found in `input_seqs`
          If all the sequences do not have the same length either aligned or
          unaligned.
      """
      try:
          seqs = [Sequence(id, seq) for id, seq in input_seqs]
      except Exception:
          seqs = []
  
      if len(seqs) == 0:
          logger = logging.getLogger(__name__)
          logger.warn('No sequences found in fasta file!')
          return None
  
      # Check that all the sequence lengths (aligned and unaligned are the same)
      aligned_lengths = set(s.length for s in seqs)
      unaligned_lengths = set(s.unaligned_length for s in seqs)
  
      if len(aligned_lengths) != 1 or len(unaligned_lengths) != 1:
          raise ValueError(
              "Not all sequence have the same length. Aligned lengths: %s, "
              "sequence lengths: %s"
              % (", ".join(map(str, aligned_lengths)),
                 ", ".join(map(str, unaligned_lengths))))
  
      seqs = sorted(seqs, key=attrgetter('frequency'), reverse=True)
      return seqs