idrepetition: Find the index for the repetition terms in a cell

Find the index for the repetition terms in a cell % [ids a] = idrepetition(A) % [e-mail]

% [ids a] = idrepetition(A)
% [e-mail]
% Example
% A = ['1' '2'
% '1' '3'
% '4' '3'];
% [ids a] = idrepetition(A)
% ==>
% ids{1} = {1 2}
% ids{2} = {4}
% ids{1} = {5 6}
% ids{1} = {3}
% a = {'1' '2' '3' '4'}';