
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
A student has to choose three subjects from Physics, Chemistry, Biology, Politics, History, and Geography to participate in a grade examination. The requirement is that at least one subject must be chosen from Physics, Chemistry, Biology, and at least one from Politics, History, Geography. The total number of possible choices for the student is ______.

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