docs: def set_unobserved_after(self,tlen,qlen,nt,p):
      """Set the unobservable sequence data after this base
  
      :param tlen: target homopolymer length
      :param qlen: query homopolymer length
      :param nt: nucleotide
      :param p: p is the probability of attributing this base to the unobserved error
      :type tlen: int
      :type qlen: int
      :type nt: char
      :type p: float
  
      """
      self._unobservable.set_after(tlen,qlen,nt,p)