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"# Consider an array of non-negative integers.\n",
"# A second array is formed by shuffling the elements of the first array and deleting a random element. \n",
"# Given these two arrays, find which element is missing in the second array.\n",
"# Here is an example input, the first array is shuffled and the number 5 is removed to construct the second array.\n",
"# Input:\n",
"# finder([1,2,3,4,5,6,7],[3,7,2,1,4,6])\n",
"# Output:\n",
"# 5 is the missing number"
]
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