
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
There are 4 white pieces and 2 black pieces in a box. Feifei takes away all the pieces in several moves, taking at least one piece each time. How many different ways can Feifei take the pieces?

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