![graph TD;
A-->B;
B-->C;](https://www.icode9.com/i/ll/?i=5a658bbf1b114edb914fa5489883ccfe.jpg?,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBA4pyY5b-15LmL5qOu6JOd,size_20,color_FFFFFF,t_70,g_se,x_16)