Test the following syllogisms for validity. If invalid, identify the fallacy it commits. 

6.All dogs are mammals. Some males are not mammals. Therefore, some males are not dogs. 

7.All philosophy professors are duplicitous creatures. Some philosophy professors are cretins. Therefore, some cretins are duplicitous creatures. 

8.No stoners are students. Some stoners are athletes. Therefore, some athletes are not students. 

9.No M is P. Some S is M. Therefore, Some S is not P. 

10.Some professors are lunatics. No lawyers are lunatics. Therefore, some lawyers are not professors.