[ps]max_depth[pe]
╰──[ps]valid_file[pe]
   ╰──[m0s]s[m0e][m0s]h[m0e][m0s]o[m0e][m0s]u[m0e][m0s]l[m0e][m0s]d[m0e][m0s] [m0e][m0s]s[m0e][m0s]h[m0e][m0s]o[m0e][m0s]w[m0e]
