Ruling on placing one stone on a man's grave and two stones on a woman's grave

Question:
The female questioners ask the Shaykh about placing stones on top of a grave, which are called *nasa'ir*. This involves placing one stone on a man's grave and two stones on a woman's grave.

Answer:
Stones are placed to preserve the soil. Whether it is one stone or two, for a man or a woman, there is no distinction. There is no difference between a woman and a man. There is no... [at] the end of the grave, from above, or from below. A brick or a stone that preserves the soil, or a marker by which the grave is recognized, is permissible.
As for specifying two stones for a woman and one stone for a man, there is no basis for this. However, graves are all the same. If one places a stone at the top or the bottom to preserve the soil, or covers it with pebbles to preserve the soil, all of this is fine.