
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
Given the function $f(x) = \begin{cases} (1-2a)^{x},x\leqslant 1 \\ \log_{a}x+ \frac {1}{3},x > 1\end{cases}$, for any real numbers $x_{1}$, $x_{2}$, when $x_{1}\neq x_{2}$, we always have $\frac {f(x_{1})-f(x_{2})}{x_{1}-x_{2}} < 0$. Find the range of $a$.

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