    Sentence 1: True, there is an occasional  mention in his column of a point raised by a  correspondent, and the Letters section of the  Magazine prints a comment from time to time,  but an important feature of the books is their  inclusion of far more writer-reader interaction  than one might suspect from reading the  column alone.    Sentence 2: The books are superior to the  columns because of the vast increase in  writer-reader interaction present.