Given an integer array nums of positive integers, return the average value of all even numbers that are divisible by $3$. If no such integers exist, return $0$.

Note: The average of $n$ elements is the sum of the $n$ elements divided by $n$, rounded down to the nearest integer.

Constraints:

• $1 \leq$ nums.length $\leq 1000$

• $1 \leq$ nums[i] $\leq 1000$

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