批处理文件生成100个文件夹，每个文件夹中包含100个子文件夹

I'm trying to create a batch script which generates 100 folders (app1, app2, app3...) along with 100 subfolders (data1, data2, data3) in each independent folder. That way, the folder "app1" will contain 100 subfolders named "data1", "data2", "data3"... The same apply to "app2", "app3"... Till now I've only got:I'm trying to create a batch script which gener