{"localization":"Indeed, if we admit that it is symmetrical, it has exactly four possible outcomes. This comes from lines 1-2 and lines 12-14. When you create your drawing, there are several figures that you can check before testing to limit the risk of illogicality: \n - The diagonals of 1: always check if it is possible to exchange 1s between them ( in which case, no need to test to know that it is not logical) \n - A line starts just after another parallel line has stopped (like the 6 and 1 of the first two lines): it is necessary check that you cannot exchange the order of the two lines. Adding a line on the line of the second which stops just before the first, or on the line of the first which starts just after the second, often avoids this thanks to the principle of alternation. Example: you could have blackened L2C1 instead of L1C1. \n - The 1s that protrude on both sides by a bar (as in your lines 12-14): same, check that we cannot swap them. \n After that, you have to test, of course, but these little tips save time. Good luck for the future.","ok":true}