` (: 1/sqrt(3) , 1/sqrt(3) , 1/sqrt(3) :)`

` (: - 1/sqrt(3) , 1/sqrt(3) , 1/sqrt(3) :)`

` (: - 1/sqrt(3) , - 1/sqrt(3) , 1/sqrt(3) :)`

` (: 1/3 , 1/3 , 1/3 :)`