Yukinori Takubo is professor of linguistics in the Graduate School of Letters at Kyoto University. Tomohide Kinuhata is visiting professor in the Department of Asian Languages and Cultures at the University of California, Los Angeles, and a Japan Society for the Promotion of Science research fellow. Szymon Grezelak is a Japan Society for the Promotion of Science research fellow at the University of Tokyo. Kayo Nagai is joint researcher at the Institute for the Languages and Cultures of Asia and Africa, Tokyo University of Foreign Studies.