Ella has a collection of marbles that she wants to organize. When she divides her marbles into groups of 4, she has 2 remaining. When she divides her marbles into groups of 6, she has 4 remaining. If Ella has fewer than 100 marbles, what is the sum of all possible quantities of marbles that she could have? Let's think step by step and output the final answer within \boxed{}.
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