opp. 톱,top
Sub:
bottom_type =,bottom_type =,bottom_type . bottom_type
{
bottom_type ???
Bottom_type
= https://en.wikipedia.org/wiki/Bottom_type
}
bottom_type =,bottom_type =,bottom_type . bottom_type
{
bottom_type ???
Bottom_type
= https://en.wikipedia.org/wiki/Bottom_type
}