
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 a high school in Shandong Province, to meet the needs of the new curriculum reform, 9 courses are offered for students to choose from. Among them, courses A, B, and C are scheduled at the same time, so at most one of them can be chosen. The school stipulates that each student must choose 4 courses. There are $\boxed{75}$ different elective schemes in total. (Answer in numerical form)

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