A population gathers plants and animals for survival. They need at least 420 units of energy, 300 units of protein, and 8 hides. One unit of plants provides 30 units of energy, 10 units of protein, and 0 hides. One animal provides 20 units of energy, 25 units of protein, and 1 hide. Only 19 units of plants and 24 animals are available. It costs 20 hours of labor to gather and prepare one unit of a plant and 12 hours of labor for an animal. How many units of plants and animals should be gathered to meet the requirements with a minimum number of hours of labor.

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