Four people , three men and one woman , are working on their computers .
The people are looking at their computer screens .
Four people, three men and one woman, are working on their computers.
The people are looking at their computer screens.
There is enough evidence here that the direction of at least three people's vision is focused on their computer screens, therefore it's logical to suggest that the people are looking at their screens.
There is enough evidence here that the direction of at least three people 's vision is focused on their computer screens , therefore it 's logical to suggest that the people are looking at their screens .