st: ANOVA with tabulated data

[Dragutin Culinovic <dragutin.culinovic@fsb.hr>]

I have student's score data, in rows by students and in columns by
exams.
How to set ANOVA command to make two-factor (by students and by exams) 
ANOVA test?

Data example:

.list
     +-------------------------------+
     | Exam1   Exam2   Exam3   Exam4 |
     |-------------------------------|
  1. |    75      78      80      73 |
  2. |    73      71      69      67 |
  3. |    60      64      62      63 |
  4. |    70      72      70      80 |
  5. |    86      90      85      92 |
     +-------------------------------+
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