Vladimir Vassilevsky wrote:

Question: Why it is impossible to have sex in the middle of the Red
Square in Moscow?

Answer: Because every idiot bystander will be eager to give his
invaluable advice.

Here is my invaluable advice: make a ring of the odd number of
invertors, compute a logical function from this ring.

If you're going hiking alone, be sure to bring along a deck of cards.

That way, if you get lost, you can sit down, start to play solitaire,
and someone will show up to help. ;-)

Cheers!
Rich