区切 くぎ 集合 しゅうごうじゃなかったです
kugirishi shūgōjanakattadesu

Noun
Desu Copula

The polite, past negative form of 区切り子集合

1. Wasn't a boundary subset.; Wasn't a dividing subset.

Past/Perfective
Negative
Polite
Casual Register
Computing