
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 solid geometry, which of the following statements is always correct? (Please fill in the serial numbers of all correct conclusions)

   ① Generally, a spatial geometric body formed by translating a planar polygon along a certain direction is called a prism;

② Cutting a pyramid with a plane results in two geometric bodies, one remains a pyramid, and the other is called a frustum;

③ Rotating a right triangle around the line containing one of its sides for a full circle forms a geometric body called a cone;

④ Rotating a right trapezoid around the line containing its leg perpendicular to the base for a full circle forms a geometric body called a truncated cone.

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