i've often had more luck passing these captchas randomly selecting 4 boxes from the grid than trying to answer it intelligently. for example it often asks to se

i've often had more luck passing these captchas randomly selecting 4 boxes from the grid than trying to answer it intelligently. for example it often asks to select a sign -- does the signpost count? only 50% of the time... similarly, it might ask to select cars. does a bus count? there is no consistency, presumably because the training data is ambiguous. does it deter spam? yes, of course. so would a 404.