A mother offered his son, on his birthday, two nice designer ties. Naturally, the son quickly took one of the two ties, put it on, and showed it smiling to his mother.
The mother, almost crying, asked "You dont like the other tie?"
The overall structure stays the same, but we have made some changes: notably, we reduced the workload by suppressing some exercises which turned out to be too difficult, and quite a few glitches have been fixed.
If you have precise suggestions for improvement, please do not hesitate to send them to the course authors, there maight still be time to take them into account.
The mother, almost crying, asked "You dont like the other tie?"