
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 choir has 90 members who plan to perform in a formation during an event. They need to stand in rows with the same number of members per row. The number of members per row should be between 4 and 15. Determine the possible number of different row-lengths the choir can be arranged in.

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