一組
also: いちくみ
ひ
と
く
み
Meanings
1
one class (of students); one group (of people); one set (of items); one pair
Used to count one unit of a group, class, set, or pair. The reading ひとくみ is standard; いちくみ is rare.
This school has classes from group 1 to group 3.
I bought one set of teacups.