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On the 2-sphere these two diagrams are equivalent. Any region can be chosen to contain the point at infinity, and this choice does not affect the PD code.
On the 2-sphere these two diagrams are equivalent. Any region can be chosen to contain the point at infinity.
On the 2-sphere these two diagrams are equivalent. Any region can be chosen to contain the point at infinity, and this choice does not affect the PD code.
