
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
Given that Nina has a collection of 5 different crystals, and the Obsidian and the Tiger's Eye crystals must not be next to each other, determine the number of ways she can arrange them.

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