Emma served Liam a cake on the windowsill .
* windowsill ( x _ 7 ) ; serve . agent ( x _ 1 , Emma ) AND serve . recipient ( x _ 1 , Liam ) AND serve . theme ( x _ 1 , x _ 4 ) AND cake ( x _ 4 ) AND cake . nmod . on ( x _ 4 , x _ 7 )