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Data Structure

def linear_search(arr, target):
    for i in range(len(arr)):
        if arr[i] == target:
            return i
    return -1  # target not found

In this implementation, `arr` is the collection being searched and `target` is the element being searched for. The function iterates over each element in `arr` and checks if it matches `target`. If a match is found, the index of the matching element is returned. If no match is found, the function returns -1 to indicate that the target element is not present in the collection.

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