
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 a sequence $\{a_n\}$ where each term is positive, and the sum of the first n terms is $S_n$. If $\log_{2}a_{n}$ forms an arithmetic sequence with a common difference of $-1$, and $S_{6}= \frac {3}{8}$, determine the value of $a_{1}$.

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