求助这段代码是什么意思

本蒟蒻没看懂这段代码代表什么，每个大括号中第一个数代表什么?_?QWQ 求各位大佬解答一下

int dot[10][8]={
    {6,0,1,2,4,5,6},{2,2,5},{5,0,2,3,4,6},{5,0,2,3,5,6},
    {4,1,2,3,5},{5,0,1,3,5,6},{6,0,1,3,4,5,6},{3,0,2,5},
    {7,0,1,2,3,4,5,6},{6,0,1,2,3,5,6}
}