Consider the following geometry problems in 3-space
Enter T or F depending on whether the statement is true or false. (You must enter T or F -- True and False will not work.)

 1. Two planes orthogonal to a third plane are parallel
 2. A plane and a line either intersect or are parallel
 3. Two lines orthogonal to a plane are parallel
 4. Two planes either intersect or are parallel
 5. Two lines either intersect or are parallel
 6. Two lines parallel to a plane are parallel
 7. Two planes parallel to a line are parallel
 8. Two lines parallel to a third line are parallel
 9. Two planes parallel to a third plane are parallel
 10. Two lines orthogonal to a third line are parallel
 11. Two planes orthogonal to a line are parallel