in reply to More efficient way to get uniq list elements from list of lists

Whenever you want 'unique elements' you should immediately be thinking 'hash keys'.

my  %hTemp;
my  @aTemp = map{@{$_}} ([1,2], [1,3], [2,3], [2,4], [3,4]);
@hTemp{@aTemp}  = ();
print join ",",(sort keys %hTemp);

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