a)857, 850, 807, 870, 805, 875, 785, 705, 708, 758, 750, 780, 578, 570, 507, 587, 580, 508.
b)885, 887, 880, 778, 775, 770, 558, 550, 557.
c) 807, 805, 870, 850, 857, 875, 705, 708, 750, 780, 758, 785, 507, 508, 570, 580, 587, 578, 500, 505, 550, 577, 575, 557, 588, 585, 558, 700, 707, 770, 755, 757, 775, 788, 778, 787, 800, 808, 880, 877, 887, 878, 855, 885, 858.