A method is disclosed for constructing non-seamed stone corners for use on outside edges formed by joining thin stone walls at right angles. In the present invention, air filtered through a filter is introduced into a containing portion of an AGV, and air in the containing portion containing a carrier is exhausted after filtering the air in the containing portion through another filter. The second image inputting unit inputs a second image. A reinforcing member is between the first piercing member and the second piercing member. A set of query suggestions is built and similarity scores are computed for at least some of the set of query suggestions to determine whether individual ones of the at least some of the set of query suggestions meet a predetermined assurance level.