
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
Propositions
1. A trapezoid is not a parallelogram;
2. The base angles of an isosceles triangle are equal;
3. A quadrilateral with two internal angles being complementary is either a trapezoid, a cyclic quadrilateral, or a parallelogram;
4. 60 is a common multiple of either 5 or 2.

Among these, the compound propositions are  .

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