The numbers $a,$ $b,$ $c,$ $d$ are equal to 1, 2, 3, 4, in some order.  Find the largest possible value of
\[ab + bc + cd + da.\]
Question:
The numbers $a,$ $b,$ $c,$ $d$ are equal to 1, 2, 3, 4, in some order.  Find the largest possible value of
\[ab + bc + cd + da.\]
Answer:
Let's think step by step.

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The numbers $a,$ $b,$ $c,$ $d$ are equal to 1, 2, 3, 4, in some order.  Find the largest possible value of
\[ab + bc + cd + da.\]
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