means probabilistic context free grammar pcfg mathematical equation algorithms presented math rmm token n pmm token n times frac left sum pmm token n times pf token ntoken n right math ''where'' '''rmm''' relative measure meaning '''token''' block text sentence phrase word '''n''' number tokens analyzed '''pmm''' probable measure meaning based corpora '' 'd''' location token along sequence '''n ''' tokens '''pf''' probability function specific language ties cognitive linguistics part historical heritage
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