sentences:  For each pair formula_292 pick a fixed bijection formula_293 from formula_290 onto formula_291.On formula_165 and formula_166 separately set formula_298 and formula_299; but given formula_38 and formula_39, set
  
  formula_302 and formula_303
  
  where formula_304 and formula_305 with formula_306 belonging to the cell formula_290 of formula_41 and formula_309 belonging to the cell formula_291 of formula_42.The various formula_312 are the coset bijections.