llm
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To determine which two boxes have a mass of 13 kg altogether, I would need more context or data about the individual masses of the available boxes. If there is a set of boxes with known individual masses, then by adding up the masses of different pairs of boxes, we can find out which pair adds up to 13 kg. For example, if there are boxes with masses of 6 kg, 7 kg, 4 kg, and 9 kg, then by pairing the boxes of 6 kg and 7 kg, we get a total mass of 13 kg (6 kg + 7 kg = 13 kg). Without specific information about the boxes, I cannot give an exact answer to which two boxes have the mass of 13 kg altogether.