/usr/share/konwert/devel/whichletters is in konwert-dev 1.8-13.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/usr/bin/perl
while (<>) {foreach (split //) {$jest{$_}++ if ord $_ >= 128}}
print +(sort {$jest{$b} <=> $jest{$a}} keys %jest), "\n";
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