premise: Five artifacts—V, W, X, Y, and Z—recovered from a sunken ship are each known to have originated in Iceland, Norway, or Sweden. These artifacts, together with the surviving fragments of a cargo list, have enabled historians to determine the following: W and Y originated in the same country. X originated in Norway or Sweden. More of the artifacts originated in Iceland than in Norway. If V originated in Iceland, then Z originated in Sweden. Exactly how many of the artifacts are there any one of which could have originated in Norway?
hypothesis: three