a framed set of prints的用法和样例：
- How many sets of prints would you like?
- She bought a set of furniture on easy terms.
- A very nice set of glasses came under the hammer yesterday.
- A set of consecutive digit time slots in which the position of each digit time slot can be identified by reference to a frame alignment signal.
- This example is used within the frame set of the preceding example to display a table of contents.