
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
In the Shanghai High School Entrance Exam (Gaokao) reform scheme, each high school student is required to choose 3 out of 6 subjects including Physics, Chemistry, Biology, Politics, History, and Geography (3 science subjects and 3 humanities subjects) for level tests. Student Ding has good grades in science and decided to choose at least 2 science subjects. The number of possible choices for Student Ding is \_\_\_\_\_\_\_\_\_\_ (represent the answer with a numerical value).

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