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Let $\cal A$ be an algebra such that ${\cal A}(x)$ is interesting.\par
Let $\cal B$ be a boolean algebra such that ${\cal B}(x)$ is interesting.\par
Let $\cal C$ be a category such that ${\cal C}(x)$ is interesting.\par
Let $\cal D$ be a digitization such that ${\cal D}(x)$ is interesting.\par
Let $\cal E$ be a plane such that ${\cal E}(x)$ is interesting.\par
Let $\cal F$ be a functional such that ${\cal F}(x)$ is interesting.\par
Let $\cal G$ be a group such that ${\cal G}(x)$ is interesting.\par
Let $\cal H$ be an entropy such that ${\cal H}(x)$ is interesting.\par
Let $\cal I$ be an ideal such that ${\cal I}(x)$ is interesting.\par
Let $\cal J$ be an operator such that ${\cal J}(x)$ is interesting.\par
Let $\cal K$ be a field such that ${\cal K}(x)$ is interesting.\par
Let $\cal L$ be a linear transform such that ${\cal L}(x)$ is interesting.\par
Let $\cal M$ be a measure such that ${\cal M}(x)$ is interesting.\par
Let $\cal N$ be a kernel such that ${\cal N}(x)$ is interesting.\par
Let $\cal O$ be an order such that ${\cal O}(x)$ is interesting.\par
Let $\cal P$ be a probability such that ${\cal P}(x)$ is interesting.\par
Let $\cal Q$ be a division ring such that ${\cal Q}(x)$ is interesting.\par
Let $\cal R$ be a ring such that ${\cal R}(x)$ is interesting.\par
Let $\cal S$ be a semigroup such that ${\cal S}(x)$ is interesting.\par
Let $\cal T$ be a transform such that ${\cal T}(x)$ is interesting.\par
Let $\cal U$ be a unit such that ${\cal U}(x)$ is interesting.\par
Let $\cal V$ be a vector space such that ${\cal V}(x)$ is interesting.\par
Let $\cal W$ be a dual space that ${\cal W}(x)$ is interesting.\par
Let $\cal X$ be an element such that ${\cal X}(x)$ is interesting.\par
Let $\cal Y$ be a dual element such that ${\cal Y}(x)$ is interesting.\par
Let $\cal Z$ be a null element such that ${\cal Z}(x)$ is interesting.\par
We might have $\cal Z=(X,Y)$ and $\cal W=(U,V)$;
but what if $\cal(I,J,K)$ is $\cal NP$-complete?\par

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  S$-\TeX}
\newcount\N \N=`A

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In \AmSTeX, one can refer to
\loop\ifnum\N<`Z $(\hat{\cal\char\N}_1,\ldots,\hat{\cal\char\N}_n)$,
 \advance\N by 1 \repeat
and even $(\hat{\cal Z}_1,\ldots,\hat{\cal Z}_n)$.

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