In the previous question, starting from the upper left corner, five numbers (45, 46, 47, 48, 49) are combined into a circular arrangement (spiral inward). The sixth group has only three numbers (45, 46, 47).

The last question is a set of arithmetic progression, starting from 99, subtracting 2 in turn, and finally 59. (The first line is a number; The number 2 in the second line, from right to left; No.3 in the third row, from left to right; Number 4 in the fourth row, from right to left; ……)