Problem 275:
Given a point $O$, a point $M_{a}$ and a point $M_{b}$, construct the triangle ABC.

Construction: 
1. Using the point $O$ and the point $M_{a}$, construct a line $m_{a}$ (rule W02);
2. Using the point $O$ and the point $M_{b}$, construct a line $m_{b}$ (rule W02);
3. Using the point $M_{a}$ and the line $m_{a}$, construct a line $a$ (rule W10a);
4. Using the point $M_{b}$ and the line $m_{b}$, construct a line $b$ (rule W10a);
5. Using the line $b$ and the line $a$, construct a point $C$ (rule W03);
6. Using the point $C$ and the point $M_{a}$, construct a point $B$ (rule W01);
7. Using the point $M_{b}$ and the point $C$, construct a point $A$ (rule W01);
8. Using the point $C$ and the point $A$, construct a point $\_M_{b}$ (rule W01);
9. Using the point $B$ and the point $C$, construct a point $\_M_{a}$ (rule W01);
10. Using the point $A$ and the point $C$ construct the line $\_b$ (rule W02);
11. Using the point $B$ and the point $C$ construct the line $\_a$ (rule W02);
12. Using the point $\_M_{a}$ and the line $\_a$ construct the line $\_m_{a}$ (rule W10b);
13. Using the point $\_M_{b}$ and the line $\_b$ construct the line $\_m_{b}$ (rule W10b);
14. Using the line $\_m_{a}$ and the line $\_m_{b}$ construct the point $\_O$ (rule W03);

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

