/usr/share/espeak-data/voices/mb/mb-br4 is in espeak-data 1.46.02-0ubuntu1.
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 | language pt 7
name brazil-mbrola-4
gender female
pitch 140 220
voicing 80
dictrules 2 3 4
mbrola br4 ptbr4_phtrans
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