Lesson 2: Example 2

(1)-----------------0------------------------0------------------------0-----------------0-----------------
(2)----------------------0--------------------------0------------------------0----------0-----------------
(3)--1--1------4---------------------4-------------------------2---------------------1------------------
(4)--0--0--------------------------------------------------------------------------------0-----------------
(5)--2--2---------5----------------------3-------------------------3-----------------2------0--1-----
(6)--0--0--------------------------------------------------------------------------------0-----------------