Consider the decision tree that predicts Mary's dietary preferences 
described during the lecture and in the handouts: 

                  CHOLESTEROL
                 /          \
            low /            \ high 
               /              \
          MARY EATS         SODIUM
         F1,F2,F3,F4       /     \
                      high/       \ low
                         /         \
           MARY DOES NOT EAT     TASTE
                 F7, F8         /    \
                           good/      \ bad
                              /        \
                       MARY EATS     MARY DOES NOT EAT
                          F5              F6


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The following is the tree format we'll use to printout that tree to 
a file:

CHOLESTEROL=low : MARY EATS=yes
CHOLESTEROL=high 
  |  SODIUM=high : MARY EATS=no
  |  SODIUM=low
  |    |  TASTE=good : MARY EATS=yes 
  |    |  TASTE=bad  : MARY EATS=no 


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The following is the rule format that we'll use to printout the
rules derived from the decision tree to a file:

if CHOLESTEROL=low then MARY EATS=yes
if CHOLESTEROL=high and  SODIUM=high then MARY EATS=no
if CHOLESTEROL=high and  SODIUM=low and TASTE=good then MARY EATS=yes 
if CHOLESTEROL=high and  SODIUM=low and TASTE=bad then MARY EATS=no 

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