int ianchor = path.i;
int janchor = path.j;
Chunk original = new Chunk(ianchor, i - ianchor, copyOfRange(orig, ianchor, i));
Chunk revised = new Chunk(janchor, j - janchor, copyOfRange(rev, janchor, j));
Delta delta = null;
if (original.getSize() == 0 && revised.getSize() != 0) {
delta = new InsertDelta(original, revised);
} else if (original.getSize() > 0 && revised.getSize() == 0) {
delta = new DeleteDelta(original, revised);
} else {