Since it is possible here to present puzzles, which you know the solution to, as chellenge for others quality standards must be changed, because not it is impossible to post short puzzle conditions. The following massage appears:
This question body does not meet our quality standards. Please make sure that it completely describes your problem - including what you have already tried - and is written using proper grammar.
This has no sense for challenge-question.
Since the other question, about slightly different, but much more important for me aspect, was closed as duplicate I add second part to this question:
Please see highlighted phrases above. They disagree with each other. Will you do something about this disagreement? If not, how I must interpret it?
How should puzzles, which I know solution to and are challenge for other, be presented here? What is format?