ruby remove duplicates from multidimensional array

names = ["Bob", "Dave", "Clive"]names2 = names.repeated_combination(2).to_a[["Bob", "Bob"], ["Bob", "Dave"], ["Bob", "Clive"], ["Dave", "Dave"], ["Dave", "Clive"],     ["Clive", "Clive"]]
I would do :
names = ["Bob", "Dave", "Clive"]names.combination(2).to_a# => [["Bob", "Dave"], ["Bob", "Clive"], ["Dave", "Clive"]]
and to correct your code :-
non_uniq_comb = names.repeated_combination(2).reject { |a,b| a == b }