So far, we have analyzed how the rules work when one of Rule 18.2(b)'s two sentences applies. However, there is often doubt, most often at the leeward mark, about which sentence applies. Consider this situation: You and Larry are approaching the zone around the leeward mark. Larry has been clear astern, but he has been gaining on you and almost has an inside overlap. When you think your bow is three lengths from the mark, you look back at Larry's spinnaker, decide that he doesn't have an overlap, and hail, "No overlap!" Larry sees the situation differently. He hails, "Overlap! Give me mark-room." You've got a problem. Of course, you could also have a very similar problem if you had been overlapped outside Larry for some time and, just before you reach the zone, you believe you've pulled clear ahead, but he believes that he still has an inside overlap.