/usr/share/doc/cadabra/algorithms/keep_terms.tex is in cadabra 1.39-0.2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | \cdbalgorithm{keep\_terms}{}
Keep the~$m$th to the~$n$th terms in a sum, dropping all others.
\begin{screen}{1,2,3}
A + B + C + D + E + F;
@keep_terms!(%){3}{5};
D + E + F;
\end{screen}
Note that counting starts from zero.
\cdbseealgo{keep_weight}
\cdbseealgo{take_match}
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