
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
Twenty phones are connected by wires in such a way that each wire connects two phones, each pair of phones is connected by at most one wire, and no more than two wires extend from any one phone. The wires need to be colored (each wire entirely with one color) such that the wires extending from each phone are of different colors. What is the minimum number of colors needed for such a coloring?

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