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Simplify this expression represented by the map

$$\begin{matrix} 1 & 1 & 0 & 1\\ 0 & 0 & 0 & 0\\ 1 & 1 & 1 & 1\\ 1 & 1 & 0 & 1 \end{matrix}$$

With variables $a,b,c,d$.

Should I be concerned I am not given the labels at the sides? I mean, can I interpret the map as

$$\begin{matrix} & ab & ab' & a'b' & a'b\\ cd & 1 & 1 & 0 & 1\\ cd' & 0 & 0 & 0 & 0\\ c'd' & 1 & 1 & 1 & 1\\ c'd & 1 & 1 & 0 & 1 \end{matrix}$$

Or

$$\begin{matrix} & ac & ac' & a'c' & a'c\\ bd & 1 & 1 & 0 & 1\\ bd' & 0 & 0 & 0 & 0\\ b'd' & 1 & 1 & 1 & 1\\ b'd & 1 & 1 & 0 & 1 \end{matrix}$$

Or etc etc?

Saturn
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    Yes, you should be concerned. The question as you have stated here is ambiguous. If this is on a professor's homework, I would ask him for clarification. – JimmyK4542 Jul 03 '14 at 05:12
  • Maybe there was a "canonical" labeling agreed upon in previous questions or the lectures? Otherwise, you should ask him – Marco13 Jul 03 '14 at 08:21

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