
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
Xiao Ming went to buy stationery while studying, planning to buy $2$ pens with the same unit price and $3$ notebooks with the same unit price. During the conversation with the shop assistant, it went as follows: Xiao Ming: Hello, I want to buy $2$ pens and $3$ notebooks. Shop Assistant: Okay, that will be $18$ yuan. Xiao Ming: I just mixed up the unit prices of the two types of stationery earlier, thinking it would be $22$ yuan. If Xiao Ming buys $1$ pen and $1$ notebook, determine the amount of money he should pay.

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