
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
At the beginning of the school term, Xiaofang and Xiaoliang went to the school store to buy study supplies. Xiaofang spent 18 yuan on 2 pens and 3 notebooks; Xiaoliang spent 22 yuan on 3 pens and 2 notebooks.  
(1) Find the price of each pen and each notebook;  
(2) After the sports meeting, the class teacher took out 400 yuan as a reward fund for the class monitor, deciding to buy 20 sets of the same prizes for students who performed outstandingly in the sports meeting. You can choose several pens and several notebooks as one set of prizes. Please list all possible combinations.

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