Find the most common 3-page sequence from the corresponding Apache log.

Assumptions:

• Standard Apache access log.
• An IP is unique per user.
• Log entries are in order.
• 3 Page sequence: 3 consecutive page requests from a user.

Output:

• The sequence
• The number of times that sequence appeared in the Apache log.

Example:

• Sequence (p1,p2,p3) was requested 2 times:

User A: Page 1

User B: Page 1 User B: Page 2 User B: Page 3 User B: Page 2

User A: Page 2 User A: Page 3 User A: Page 4 User A: Page 1 User A: Page 2