
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
Through the midpoints $M$ and $N$ of the edges $AD$ and $CC_1$ of the parallelepiped $ABCD A_1 B_1 C_1 D_1$, a plane is drawn parallel to the diagonal $DB_1$. Construct the section of the parallelepiped by this plane. In what ratio does it divide the edge $BB_1$?

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