
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
A bus ticket costs 1 yuan each. Xiaoming and 6 other children are lining up to buy tickets. Each of the 6 children has only 1 yuan, while Xiaoming has a 5-yuan note. The seller has no change. In how many ways can they line up so that the seller can give Xiaoming change when he buys a ticket?

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