Is it really that difficult? Check it out at https://bit.ly/18pjG3w and see if you can do better than your peers. Here's the test: Count numbers, alternating between two languages, e.g. English/French, as in "One, deux, three, quatre, five, six, seven, huit, nine, dix". Try. Why is it far more difficult than counting backward and skipping all even numbers? Read comments at https://bit.ly/18pjG3w, with implications regarding big data algorithm implementation. Good luck, Vincent You may leave the list at any time by sending the command SIGNOFF allstat to [log in to unmask], leaving the subject line blank.