[id: lrzzmakvxgxbyjvn] i($x held a lecture on $bla. what did $x talk about?) => o($bla)
[id: lrzzmakvxgxbyjvn] input($x held a lecture on $bla. what did $x talk about?|$x held an lecture on $bla. what did $x talk about?) => output($bla)