Write Down (Without Solving) the Dual LP Problem $p = x + y + z + w$

Essay

Write down (without solving) the dual LP problem.
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Maximize $p = x + y + z + w$ subject to
​ $$\begin{array} { l } x + y + z \leq 7 \\y + z + w \leq 9 \\x + z + w \leq 6 \\x + y + w \leq 8 \\x \geq 0 , y \geq 0 , z \geq 0 , w \geq 0\end{array}$$ ​
Use the letters s, t​, u, and v in the indicated order.
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Minimize $c =$ __________ subject to the constraints.
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Please enter the inequalities, separated by commas.