Problem 108:
Given a point $B$, a point $C$ and a point $M_{b}$, construct the triangle ABC.

Construction: 
1. Using the point $C$ and the point $M_{b}$, construct a point $A$ (rule W01);
2. Using the point $C$ and the point $A$, construct a point $\_M_{b}$ (rule W01);

Statement:
Prove that the point $M_{b}$ is identical to the point $\_M_{b}$.

