History

Time	Change
2015-12-21 02:07:54+00:00	Created
2015-12-21 02:07:54+00:00	Associated with 超集合
2015-12-21 02:07:54+00:00	Associated with スーパーセット
2015-12-21 02:07:54+00:00	Associated with superset
2015-12-21 02:09:22+00:00	Associated with 上位集合