The Annotation Guideline of LST20 Corpus. - Prachya Boonkwan; Vorapon Luantangsrisuk; Sitthaa Phaholphinyo; Kanyanat Kriengket; Dhanon Leenoi; Charun Phrombut; Monthika Boriboon; Krit Kosawat; Thepchai Supnithi (CoRR, 2020)