よん次元 じげん ちょう立方 りっぽう たいじゃありませんでした
yonji genchōrippō taija arimasendeshita

Noun
Desu Copula

The polite, past negative form of 四次元超立方体

1. It was not a four-dimensional hypercube.

Past/Perfective
Negative
Polite
Terminal Form