- Allen relations are classified relations between two time intervals into thirteen types. Each relation has an inverse relation except for the equals relation (e.g., before versus after relations).
Allen relations
From Japanese and Asian Historical Resources in the Digital Age by The National Museum of Japanese HistoryMakoto Goto, Satoru Nakamura, Chifumi Nishioka, Arianti Ayu Puspita, Taizo Yamada, Yuta Hashimoto, Natsuko Yoshiga, Tatsuki Sekino, Naoki Kokaze, and Shohei Yamasaki
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