
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
An athlete decided to run a distance of $15 \mathrm{~km}$. He started by running $5 \mathrm{~km}$ to the South, then turned East, running another $5 \mathrm{~km}$, and then turned North, running the remaining $5 \mathrm{~km}$. After this route, he surprisingly found himself back at the starting point. Identify two possible points on the Earth where this athlete could have started his run.

Present the answer in LaTex format: \boxed{Your answer}
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