1. Build a decision tree using the algorithm discussed in the class. 
    f1   f2   f3   f4
0    0    0    0    w1
0    1    1    0    w1
1    0    1    0    w1
0    0    1    1    w2
1    1    0    0    w2
0    0    1    0    w2
  2. Find item sets whose support >= 50% and all association rules whose confidence >= 70%. 
    TID       Items
1        A B D E
2        B C D E
3        A B D
4        A C D E
5        B D E
6        A B E
7        B D E