Olga, thank you! You gave to us a lot of things! Do you remember the first question from our side? It was be like "It`s PI?! ..." And in our mind "what are she talking? What does she want? Where am I ?!" But after two month all of us has understood you correctly! And now just sometimes we can ask to repeat or explain something (smiley) So all of us, including teacher and students, did a lot of work - congratulation!!! We have done the job - we have the result! Now I even talk with myself (in my head) on english (smiley) One more thought which you know but I havo to tell you: "You are the strong , powerful and good teacher"! And I forgot to tell you one story in polyglot: one day when you taught in movie club and after that we had chit-chat class - several guys met you in the first time and discussed you during the break "who is she? Who ... who ..." - you liked guys. And I said she was my teacher (with a serious voice) )))