x1 is a (topological) hole in object x2
Refers to a "hole" in the topological sense, i.e. one which goes all the way through an object, such as a hole in a sheet of paper. For non-topological holes (ones that do not go all the way through, such as a hole in the ground), use kevna. See also canko, kalri, canlu. Proposed rafsi -dol-