
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
The following propositions are given:  
① "m > 0" is a necessary and sufficient condition for "the equation $x^2 + my^2 = 1$ to represent an ellipse";  
② "a = 1" is a sufficient but not necessary condition for "line $l_1: ax + y - 1 = 0$ to be parallel to line $l_2: x + ay - 2 = 0$";  
③ "The function $f(x) = x^3 + mx$ is monotonically increasing" is a necessary and sufficient condition for "m > 0";  
④ Given that p and q are two non-equivalent propositions, then "p or q is true" is a necessary but not sufficient condition for "p and q are true".  
Among these, the numbers of all true propositions are.

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