    Sentence 1%: True, there is an occasional  mention in his column of a point raised by  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: There is much more writer-reader  Tateraction present In the books then In the    columns.    