If in the question, find all the triplet what is it mean
they asking for unique triplet (one number is using in only one triplet)
or
for all the triplets? (One number can use in another triplet)
Understand with the following examples
From the below triplets,
(1, 1, 1), (1, 2, 3), (1, 1, 1), (3, 2, 1), (1, 2, 3), (2, 2, 2);
Unique triplets are:
(1, 1, 1), (1, 2, 3), (3, 2, 1), (2, 2, 2)