
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
Observe the following equalities:  
$(1+1)=2\times1$  
$(2+1)(2+2)=2^2\times1\times3$  
$(3+1)(3+2)(3+3)=2^3\times1\times3\times5$  
...  
Following this pattern, the fourth equation can be represented as ______ .

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