"a" + DELTA + "b.com",
          "abc.a23",
          "biz.com.ua",
          "f--1.com",
          "f--o",
          "f-_-o.cOM",
          "f11-1.com",
          "fOo",
          "f_a",
          "foo.com",
          "foo.net.us\uFF61ocm",
          "woo.com.",
          "www",
          "x",
          ALMOST_TOO_LONG,
          ALMOST_TOO_MANY_LEVELS
          // keep-sorted end
          );