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Symbols for intersection points.
| Symbols | Intersection Points |
|---|---|
| B1, B2, B3 | three circles |
| P1, P2 | two intersection points of B1 and B2 |
| Q1, Q2 | two intersection points of B2 and B3 |
| R1, R2 | two intersection points of B1 and B3 |
| P, Q, R | three vertices of the triangle |
