
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 propositions about spatial vectors:  
① Two vectors with different directions cannot be collinear vectors;  
② Vectors with equal length and the same direction are equal vectors;  
③ Two parallel vectors with equal magnitude are equal vectors;  
④ If $\overrightarrow{a} \neq \overrightarrow{b}$, then $|\overrightarrow{a}| \neq |\overrightarrow{b}|$.  
Among these, the sequence numbers of all true propositions are __________.

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