http://dkforestseeaaq2dqz2uflmlsybvnq2irzn4ygyvu53oazyorednviid.onion/captcha-help
You can start by finding a long line that doesn't have dashes in it, follow that line until you find the edge. Then go back and follow the line to the other edge and note the 6 numbers that the line cross path with. The direction is not important, both combination will work.