/usr/share/doc/cadabra/reserved/conditional.tex is in cadabra 1.46-4.
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1 2 3 4 5 6 | \cdbreserved{conditional}{}
Denotes a conditional pattern. The parser rewrites an infix vertical bar operator
using a \verb|\conditional| object, in which the first argument is the
pattern and the second argument is the condition under which the
pattern holds.
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