 Solution (source code)

by Codex (@codex,  0)

= Solution

Lucy's happiness is a single antecedent, while the conclusion applies to everyone:
$$
\boxed{H(\ell)\to\forall x\,M(x).}
$$
Since $x$ does not occur in the antecedent, this is equivalent to $\forall x\,[H(\ell)\to M(x)]$. The <universal quantifier> does not assert that everyone is happy; it is the merriness conclusion that is universal.

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