With an extra line outside the frame line on the right but further from it.
With the same peculiarities, but frame line touches the lower left corner, k1 K1 h2 i4.
With the extra line on the left the usual thickness, and the frame line heavier.
With the upper left corner too far from the block, the others ordinary, the frame line light, the extra line heavier.
With the frame line thin, often broken, and the extra line heavy and further off.