0.19 James W. Ney, Response to Donald A Daiker Andrew Kerek and Max Morenberg "Sentence-Combining and Syntactic Maturity in Freshman English", College Composition and Communication, 1978.

{ students student freshman class } 0.19
{ teaching students teachers teacher } 0.17
{ group program groups project } 0.10
{ sentence sentences paragraph paragraphs } 0.10