DATA FW13P02; TITLE 'CHAPTER 13, PROBLEM 2';
INPUT  SUBJ    BEFORE    AFTER;
CARDS;
 1       186      188
 2       171      177
 3       177      176
 4       168      169
 5       191      196
 6       172      172
 7       177      165
 8       191      190
 9       170      165
10       171      180
11       188      181
12       187      172