| { data file information code } | 0.41 |
| { form set case single } | 0.21 |
| { number found study results } | 0.08 |
| { system user software systems } | 0.05 |
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Martin Kay, Standards for Encoding Data in a Natural Language, Computers and the Humanities, 1967.
Robert W. Hsu, A New String-Manipulating Language, Computers and the Humanities, 1968.