1> foo
2analyze(foo) = st:foo id:1
3analyze(foo) = st:foo id:3
4stem(foo) = foo
5> bar
6analyze(bar) = st:bar
7stem(bar) = bar
8> foobar
9analyze(foobar) = pa:foo st:foo id:3 pa:bar
10stem(foobar) = foo
11> barfoo
12analyze(barfoo) = pa:bar st:bar pa:foo st:foo id:3
13stem(barfoo) = barfoo
14