How did the son make a rope of ashes in the story of the aged mother?

In the story of "The Aged Mother," the son makes a rope of ashes as a symbolic gesture to honor his mother's wisdom and love. After the cruel edict from the ruler to abandon aged parents, he initially follows the command but ultimately decides to return to care for his mother. To demonstrate his deep sorrow and the futility of the ruler's decree, he gathers the ashes from the fire and weaves them into a rope, representing the unbreakable bond between him and his mother despite the oppressive circumstances. This act underscores the themes of loyalty and the enduring connection between generations.