
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 that the numbers represented by points $A$ and $B$ on the number line are $1$ and $3$ respectively. Moving $2$ units in the negative direction from point $A$ leads to point $C$, while moving $2$ units in the positive direction from point $B$ leads to point $D$. The distance between points $C$ and $D$ is ______ units.

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