1> foo
2analyze(foo) =  st:foo po:noun xx:other_data
3stem(foo) = foo
4> foox
5analyze(foox) =  st:foo po:noun xx:other_data is:affix_x
6stem(foox) = foo
7> fooy
8analyze(fooy) =  st:foo po:noun xx:other_data ds:affix_y
9stem(fooy) = fooy
10> fooyx
11analyze(fooyx) =  st:foo po:noun xx:other_data ds:affix_y is:affix_x
12stem(fooyx) = fooy
13