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> foo analyze(foo) = st:foo id:1 analyze(foo) = st:foo id:3 stem(foo) = foo > bar analyze(bar) = st:bar stem(bar) = bar > foobar analyze(foobar) = pa:foo st:foo id:3 pa:bar stem(foobar) = foo > barfoo analyze(barfoo) = pa:bar st:bar pa:foo st:foo id:3 stem(barfoo) = barfoo