If I write the following (and must I write it myself?) is this all possibilities? 1 <=A <=10 1 <=B <=10 1 <=C <=10 1 <=D <=10 1 <=E <=10 A+B×C-D÷E A+B×C÷D-E A+B-C×D÷E A+B-C÷D×E A+B÷C-D×E A+B÷C×D-E ...and every other possibility? I know I have posted similarly before but if you have not written the above (including the next eighteen combinations) would you not understand what I am trying to convey? If every possibility has been attempted, and not one is correct, will not the theory of artificial intelligence remain forever? CAN YOU PLEASE WRITE THE ABOVE COMBINATIONS YOURSELF BEFORE POSTING, ELSE WOULD YOU NOT UNDERSTAND? Are there any more numerical symbols than 0-9? If a column leftward is added when nine is reached, can the symbols not be re-used? I cherish the thought of your reply. Awaiting eagerly, Counter.