
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
For the function $f(x)$, if there exists $x_0 \neq 0$ such that $f(x_0) = -f(-x_0)$, then the points $(x_0, f(x_0))$ and $(-x_0, f(-x_0))$ are called a pair of odd symmetry points of the function graph. If $f(x) = e^x - a$ (where $e$ is the base of the natural logarithm) has odd symmetry points, then the range of values for the real number $a$ is $\boxed{.}$

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