1. The problem asks to find the value of the expression $abcd$. 2. To solve this, we need the values of $a$, $b$, $c$, and $d$. 3. Since the values of $a$, $b$, $c$, and $d$ are not provided, we cannot compute $abcd$. 4. Please provide the values of $a$, $b$, $c$, and $d$ to proceed with the calculation.