
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: \\
(1) $\exists x_0 > 0$, such that $|x_0| > x_0$; \\
(2) $\forall x < 0$, $|x| > x$; \\
(3) $ab < 0 \Leftrightarrow \frac{a}{b} < 0$; \\
(4) The proposition "$p \land q$" being false is a sufficient but not necessary condition for "$\neg p$" to be true.

The sequence numbers of all true propositions are ______.

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