/usr/lib/R/site-library/triebeard/INDEX is in r-cran-triebeard 0.3.0-2.
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 | alter Add or remove trie entries
getters Trie Getters
greedy_match Greedily match against a tree
longest_match Find the longest match in a trie
prefix_match Find the prefix matches in a trie
trie Create a Trie
triebeard Radix trees in Rcpp
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