いつかの ... => Previously N4
Time
一緒に => together N5
ひとつまちがえば => Just (negligence) N3
Ability
べつだんの => particular; special N2
Description
の[末「すえ」]/た[末「すえ」] => conclusion N2
Reason, Result, Response
(の中)で~が一番~です => out of this group, [A] is best N5
一度に => all at once N3
一通り => Basically, (get) over, done N2
Base, base
の[上「うえ」]では => As… N4
Situations and Experiences
一方だ => more and more; continue to ~ N2
~且つ(かつ) => and N1
Line up, list
一応 => more or less; pretty much; roughly; tentatively ~ N2