As Himuro looks out over a sunset colored ocean from her room in the resort hotel, Yukimura barges in saying, "we have to do now what we couldn't do this afternoon." The next day, it's finally time to make their presentations in front of a huge audience. Kosuke boldly gives his presentation on romantic visual novel games, but one of the professors grills him, asking, "what purpose does this research serve?" On the other hand, when Kanade falls into a panicked state just before her presentation, Yukimura hugs her, not realizing that Himuro is watching.
This type of problem has 
been proven to be NP-hard.
.تمّ إثبات كون هذه الإشكاليّة من مستوى صعوبة إن-بي
Ein Problem,
das bewiesenermaßen NP-schwer ist.
Este problema ha sido probado
como NP-hard.
Este problema ha sido probado
como NP-hard.
C’est donc un problème NP-difficile.
È stato provato che questo tipo
di problema è NP-difficile.
Foi provado que este tipo
de problema é NP-difícil.
А такие задачи, как известно, 
являются NP-трудными.