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Waveform Audio File Format  |  1995-11-14  |  402.1 KB  |  1 channel  |  11,025 sample rate  |  18 seconds
Transcription: Three of the lines on the tetrahedron, RS, ST, and RT, can also be seen in their entirety outside the intersection area. So, they do not intersect the plane. Their visibility is found by a visibility test on the tetrahedron.