sentences:  Collectively, coset bijections describe formula_251 between the subsets formula_165 and formula_166.They also determine formula_5 and formula_1 for pairs of elements from distinct formula_29-classes.Indeed, given formula_38 and formula_39, let formula_265 be the
  cost bijection between the cosets formula_266 in formula_165 and formula_268 in formula_166.