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\documentclass{article}
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\lxDeclare[role=ID]{$a$}%
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\lxDeclare[role=ID]{$b$}%
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\lxDeclare[role=ID]{$c$}%
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\lxDeclare[role=ID]{$d$}%
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\lxDeclare[role=ID]{$e$}%
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\[ \left.\begin{array}{l} a \\ b \end{array}\right\}
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= \left\{\begin{array}{l} c\\ d\end{array}\right. \]
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\[ \left(\begin{array}{l} c\\ d\end{array}\right) \]
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\[ (a + \left(\begin{array}{l} c\\ d\end{array}\right) + b) \]
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\[ a + { b \atop c } + d \]
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\[ a + \left[ b \atop c \right] + d \]
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\[ \left( {a \over b} \right) \]
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\[ \left[ {a \over b} \right] \]
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\[ \left\lbrack {a \over b} \right\rbrack \]
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\[ \left\{ {a \over b} \right\} \]
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\[ \left\lbrace {a \over b} \right\rbrace \]
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\[ \left\lfloor {a \over b} \right\rfloor \]
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\[ \left\lceil {a \over b} \right\rceil \]
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\[ \left< {a \over b} \right> \]
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\[ \left\langle {a \over b} \right\rangle \]
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\[ \left| {a \over b} \right| \]
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\[ \left\vert {a \over b} \right\vert \]
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\[ \left\| {a \over b} \right\| \]
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\[ \left\Vert {a \over b} \right\Vert \]
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\[ \left\uparrow {a \over b} \right\downarrow \]
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\[ \left\Uparrow {a \over b} \right\Downarrow \]
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\[ \left\updownarrow {a \over b} \right\Updownarrow \]
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\[ a + \left\foo {b \over c} \right\bar + d \]
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\[ {a \over b} \left/ {c \over d} \right. \]