There are two numbers: 66, 65, 68, 56, 55, 58, 86, 85, 88, and three numbers: 665, 668, 565, 566, 568, 588, 586, 866, 865, 856, 886, 886. The four digits are: 6655, 6658, 6688, 6558, 6588, 6556, 6565, 6568, 6655, 6658, 6588, 6558, 5566, 5665, 5656, 5588, .8856. There are five numbers: 66558, 65586, 65568, 66585, 66588, 66885, 66858, 65588, 65586, 658868566, 88665, 88556, 88655 and so on.