/usr/share/doc/r-cran-pillar/tests/testthat/out/letters-inf.txt is in r-cran-pillar 1.0.1-1.
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 | [3m[90m <chr> [39m[23m
[90m1[39m a b c d e f g h i j k l m n o p q r s t u v w x y z
[3m[90m <chr> [39m[23m
[90m1[39m a b c d e f g h i j k l m n o p q r s t u v w x y z
[3m[90m <chr> [39m[23m
[90m1[39m a b c d e f g h i j k l m n o p q r s t u v w x y z
[3m[90m <chr> [39m[23m
[90m1[39m a b c d e f g h i j k l m n o p q r s t u v w x y z
|