Let $p,$ $q,$ $r,$ $s$ be the roots of
\[3x^4 - x + 12 = 0.\]Find $pqr + pqs + prs + qrs.$The answer is in the form rac{m}{n}, where gcd(m, n) = 1. Please provide the value of m + n.

Let's think step by step and output the final answer within \boxed{}.
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