> bar
analyze(bar) =  st:bar <BAR <ZERO>>
analyze(bar) =  st:bar <BAR >
analyze(bar) =  st:bar <BAR <ZERODERIV> <ZERO>>
analyze(bar) =  st:bar <BAR <ZERODERIV> >
stem(bar) = bar
> foo
analyze(foo) =  st:foo <FOO >
stem(foo) = foo
> barbaz
analyze(barbaz) =  st:bar <BAR <DERIV> <ZERO>>
analyze(barbaz) =  st:bar <BAR <DERIV> >
stem(barbaz) = bar
