Listen to the sound clip In order to access different parts of the building, you will have to enter a code using layers of addition, sub traction and multiplication. As part of a protocol from G. U. N. Contaiment facilities worldwide. from Half-Life 1 Black Mesa Announcement System (Vox) SQ TTS Computer AI Voice:
In order to access different parts of the building, you will have to enter a code using layers of addition, sub traction and multiplication. As part of a protocol from G. U. N. Contaiment facilities worldwide.
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