Pedro has 1red marble, 1 blue marble, 1 yellow marble and 1 green marble. He told Frank to take 2 marbles. What are the possible combinations? List the pairs.

1red marble, 1 blue marble

1red marble, 1 yellow marble

1red marble, 1 green marble

1 blue marble, 1 yellow marble

1 blue marble, 1 green marble

1 yellow marble, 1 green marble

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