preface.txt
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  1  After a few computer science courses, students may start to
  2  get the feeling that programs can always be written to
  3  solve any computational problem.  Writing the program may
  4  be hard work.  For example, it may involve learning a
  5  difficult technique.  And many hours of debugging.  But
  6  with enough time and effort, the program can be written.
  7
  8  So it may come as a surprise that this is not the case:
  9  there are computational problems for which no program
 10  exists.  And these are not ill-defined problems (Can a
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command: o
file: introduction.txt