In1960, David D. Thomas published Basic Vocabulary in some Mon Khmer Languages AL 2 , no. 3 , pp. 7 - 11 ), which compares 8 Mon-Khmer languages with theI-E language data on which Swadesh based the revised retention rate ( * * f ) in place of original ( * * f ), and his revised 100 word basic glottochronological list inTowards Greater Accuracy ( IJAL 21 : 121 - 137 ).