'BonTen' - Corpus Concordance System for 'NINJAL Web Japanese Corpus'. - Masayuki Asahara; Kazuya Kawahara; Yuya Takei; Hideto Masuoka; Yasuko Ohba; Yuki Torii; Toru Morii; Yuki Tanaka; Kikuo Maekawa; Sachi Kato; Hikari Konishi (COLING (Demos), 2016)