Q2.
Here is an unusual program.
At first glance you may think it’s not a SAS program at all, but it is made of statements each ending with a semi-colon and each beginning with a SAS key-word – data, set and put.



data means nothing;

set your mind to the task;

put your shoulder to the wheel. With the proper

ratio of work/desire -- plus some luck -- all can come true. ;

Can you think under what circumstances this program will run without giving any errors.
There is nothing to hand in here but you should think about this problem nonetheless.

JUST FOR FUN！