docs: private static long[] rtable(int n) {
          return new long[]{
                  0x00000000l << n, 0x00000001l << n, 0x00000100l << n, 0x00000101l << n,
                  0x00010000l << n, 0x00010001l << n, 0x00010100l << n, 0x00010101l << n,
                  0x01000000l << n, 0x01000001l << n, 0x01000100l << n, 0x01000101l << n,
                  0x01010000l << n, 0x01010001l << n, 0x01010100l << n, 0x01010101l << n
          };
      }