
  Key to results table
  a - Question difficulty;          ╔═══════════════════════════════════╗
  b - Student's name;               ║   a       b        c          d   ║
  c - Date exercise completed       ╠═══════════════════════════════════╣
      (according to computer's DOS  ║   e            f              g   ║
      clock);                       ╠═════╤══════════════╤══════════════╣
  d - Set of results being viewed.  ║     │              │              ║
      The last ten sets are stored  ╠═════╪══════════════╪══════════════╣
      on disk;                      |  h  |      i       |      j       |
  e - Level (1-8) of results shown  ║     │              │              ║
      on screen;                    ╚═════╧══════k═══════╧══════════════╝
  f - Type of questions asked;
  g - The number of extra questions asked.  To successfully complete an
      exercise, eight questions must be answered correctly.  If more than
      eight are required, the number of extra questions posed is shown here;
  h - Question number;
  i - The actual question set - the correct answer is highlighted;
  j - The actual answer given by the student or '√' if the answer is
      correct.  'Not attempted' means <Esc> was pressed before this
      question was reached, or that the exercise was not attempted;
  k - This tells you how to navigate through the results.  There are
      eight questions per exercise, four exercises per level and eight
      levels per set.

      Shortcut: press a number to load that set (0=10).
