Sequence Data (cont.)

Sequence of function accesses contains important information

Sequence of function accesses:
a b a d a b a d a b a d a b a d a b a d a b a d a b a d a 
b a d a b a d a b a d a c a e a c a e a c a e a c a e a c 
a e a c a e a c a e a c a e a c a e a c a e a

How do we represent sequence information?