
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
In space: ① If four points are not coplanar, then any three of these points are not collinear;  
② If two lines have no common point, then these two lines are skew lines. Among the above two propositions, the one whose converse is true is.

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