
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
In the table below, fill in the nine cells with the numbers $-3$, $-2$, $-1$, $0$, $1$, $2$, $3$, $4$, $5$ respectively, so that the sum of three numbers in each row, each column, and each diagonal is equal. If $a$, $b$, $c$ represent three numbers in the grid, then the value of $a-b-c$ is ______.

| $-2$ | $a$ | $0$ |
|------|-----|----|
|      |     | $b$|
| $c$  |     | $4$|

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