docs: def _combine_results(self, match_as_dict):
              '''Combine results from different parsed parts:
              we look for non-empty results in values like
              'postal_code_b' or 'postal_code_c' and store
              them as main value.
  
              So 'postal_code_b':'123456'
                  becomes:
                 'postal_code'  :'123456'
              '''
              keys = []
              vals = []
              for k, v in six.iteritems(match_as_dict):
                  if k[-2:] in '_a_b_c_d_e_f_g_h_i_j_k_l_m':
                      if v:
                          # strip last 2 chars: '..._b' -> '...'
                          keys.append(k[:-2])
                          vals.append(v)
                  else:
                      if k not in keys:
                          keys.append(k)
                          vals.append(v)
              return dict(zip(keys, vals))