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#expressibility

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easyAI-checkedKnowledge Representation & Reasoning

In an interpretation whose domain is people, $W(x)$ means " $x$ is a woman" and $O(x, y)$ means " $x$ is an offspring of $y$ ". Which formula expresses " $x$ is $y$ 's mother"?

$W(x) \land O(x,y)$ 1
$W(y) \land O(y,x)$ 2
$W(y) \land O(x,y)$ 3
$W(x) \land O(y,x)$ 4

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