Key: E
Introduction:
E
(A) t4 t2 t1 t2
1 3 1 3 1 2 3 2 3 1
E
t4 t2
1 3 1 3 1 1 3 1 3
E
t2 t2 t4 t2
1 3 3 1 3 3
E
t2
1 3 3 1 3 3
E
t2 t1 t4 t4
1 3 4 3 2 3 1 3 2 3 2
E
t2 2 2 4 2 t1 t1
1 1 1 1 1 3 1 3 1 3
E
t4 t3 t2 t4
3 1 3 1 3 3 1 4 1 4 1
E
t2 2 2 4 2 t2
3 3 4 3 4 1 4 3 4 3 4
E
t3 t1 t4
2 4 2 4 2 1 1 2 1 2 1
E
t1 1 1 4 1
3 2 3 2 3 3 2 3 2 3
E
t2 t1 t2
1 2 1 3 1 1 1 1 3 1
E
1 2 1 2 1 1 2 1 2 1
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
E
t1 t1 t1
3 2 3 2 3 3 4 3 2 3
E
t1 1 1 4 1
2 2 1 2 1 1 2 1 2 1
E
t4 t1 t1
1 3 1 1 1 3 1 3 2 1 2 3
E
t4 t2 t2
1 3 4 3 4 3 1 3 4 3 4 3
E
t4 t2
1 3 3 2 3 1 1 1
E
t2 2 2 4 2 t1 (B) t1 t2 t2
1 1 1 2 4 1 3 1 1 3
E
t2 t1 t1
1 1 2 2 2
E
t2 t2
1 1 1 1 1 3 3 3 3 3
E
t1 t4
3 2 3 2 3 1 2 1 2 1
E
t2
1 2 1 2 1 3 3 3 3 3
E
t2 t2 t2
3 1 1 1 1 3 4 3
E
t2 t2
1 1 1 1 1 3 3 3 3 3
E
t1 t4
3 2 3 2 3 1 2 1 2 1
E
1 2 1 2 1
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
E
t4 t2 t2 t2
1 3 1 3 1 1 3 4 3 1
E
t1 t1
1 1 1 3 1 1 1 2 3
E
t1
1 1 2 3 1 2 3 4
E
4 3
1 &nb