was used for the 100-million-word British National Corpus (BNC). A general-purpose grammatical tagger, it is a successor of the CLAWS1 tagger. In tagging the BNC, the many rounds of work that went into CLAWS4 focused on making the CLAWS program independent from the tagsets. For example, the BNC project used two tagset versions: "a main tagset (C5) with 62 tags with which the whole of the corpus has been tagged, and a larger (C7) tagset with 152 tags, which has been used to make a selected 'core' sample corpus of two million words." The latest version of CLAWS4 is offered by UCREL, a research center of Lancaster University. CLAWS5 tagset The CLAWS5 tagset, which was used for BNC, has over 60 tags. See Table of tags in C5 tagset here. CLAWS6 tagset The CLAWS6 tagset was used for the BNC sampler corpus and the COLT corpus. It has over 160 tags, including 13 determiner subtypes. See Table of tags in C6 tagset here. CLAWS7 tagset The standard CLAWS7 tagset is used currently. It is only different in the punctuation tags when compared to the CLAWS6 tagset. See Table of tags in C7 tagset here. CLAWS8 tagset CLAWS8 tagset was extended from C7 tagset with further distinctions in the determiner and pronoun categories, as well as 37 new auxiliary tags for forms of be, do, and have. See Table of tags in C8 tagset here External links CLAWS part-of-speech tagger for English Brill tagger Part-of-speech tagging Sliding window based part-of-speech tagging British National Corpus (BNC) Brown Corpus Lancaster University Hidden Markov model References Natural language processing Corpus linguistics Tasks of natural language processing Markov models Word-sense disambiguation