
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
Among the following four statements about algorithms, the correct one is __________. (Only fill in the serial number)

 ⑴ Some steps of an algorithm can be unclear or ambiguous to allow the algorithm to solve more problems;

 ⑵ A correct algorithm will definitely yield a definite result after execution;

 ⑶ The algorithm for solving a certain type of problem is not necessarily unique;

⑷ A correct algorithm will definitely end within a finite number of steps.

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