docs: def _rngs(self):
        """This is where we should also enforce evidence requirements"""
        outputs = []
        if len(self._exon_groups)==1:
           return [self._exon_groups.consensus('single')]
        z = 0 #output count
        begin = 0
        meeting_criteria = [i for i in range(0,len(self._exon_groups)) if  len(self._exon_groups) >= self._evidence]
        if len(meeting_criteria) == 0: return []
        finish = len(meeting_criteria)
        if len(meeting_criteria) > 0:
           begin = meeting_criteria[0]
           finish = meeting_criteria[-1]
        for i in range(0,len(self._exon_groups)):
           if z == begin:
              outputs.append(self._exon_groups[i].consensus('leftmost'))
           elif z == finish:
              #len(self._exon_groups)-1:
              outputs.append(self._exon_groups[i].consensus('rightmost'))
           else:
              outputs.append(self._exon_groups[i].consensus('internal'))
           z += 1
        v = [seqtools.structure.transcript.Exon(x) for x in outputs]
        v[0].set_leftmost()
        v[-1].set_rightmost()
        return v