
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 propositions, the true one is __________. (Fill in the serial number)

① The converse of the proposition "If $x>y$, then $x>|y|$"

② The negation of the proposition "If $x>1$, then $x^2>1$"

③ The negation of the proposition "If $x=1$, then $x^2+x-2=0$"

④ The contrapositive of the proposition "If $x^2>0$, then $x>1$"

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