
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 parallelepiped \(ABCD A_1B_1C_1D_1\), points \(K\) and \(M\) are taken on the lines \(AC\) and \(BA_1\) respectively, with \(KM \parallel DB_1\). Find the ratio \(KM: DB_1\).

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