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Expressions can be "enclosed" in various ways
via the
\enclose{} macro.
For example
produces
\[
\enclose{box}{
\enclose{circle}{\bbox[5px]{x+y}} +
\enclose{circle}{\enclose{circle}{z}} -
\enclose{updiagonalstrike,downdiagonalstrike}{w}
}
\]
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