
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
If a line is perpendicular to in a plane: ① two sides of a triangle; ② two chords of a circle; ③ a pair of adjacent sides of a parallelogram; ④ the two non-parallel sides (legs) of a trapezoid, which of these can demonstrate that the line is perpendicular to the plane? (Fill in the serial numbers only)

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