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/usr/share/espeak-data/voices/mb/mb-us2 is in espeak-data 1.46.02-0ubuntu1.

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name us-mbrola-2
language en-us
language en 7
gender male

phonemes en-us
dictrules 3 6

stressLength 170 135 205 205 0 0  245 275

pitch 82 117
voicing 80
mbrola us2 us_phtrans