Four or seven noodles, five or seven steamed buns, six or seven yellow rice, and seven or seven dumplings. Today, it's simpler. The mourning period is usually 3, 5 or 7 days. In the old days, there were ceremonies such as ceremony notes, opening ceremony and thanking thick people, which have now been abolished. Solemnly declare: this answer is for reference only, please don't be blindly superstitious.