21 20018
1 1 2 2 3 3 5 4 7 5 8
1
1 1 2 2
2 3 1981 1983 1985 1987 1989 1991 1993 1995 1997 1999 3
4 4
3 5 6 5
1 5,000 1716 4,592 6
4 7
5 8
9 1
2 3 10
MEMO