
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 four students with student numbers 1, 2, 3, and 4, whose exam scores $x_i \in \{89, 90, 91, 92, 93\}$ ($i=1, 2, 3, 4$) and satisfy $x_1 < x_2 \leq x_3 < x_4$. How many possible combinations of exam scores are there for these four students?

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