One Line With Go,Java,Python3---->Python3
1. Python Solutions: \n\nclass Solution:\n    def getConcatenation(self, nums: List[int]) -> List[int]:\n        return nums*2\n\n\n# 2. Java Solutions\n\nclass
# 1. Python Solutions: \n```\nclass Solution:\n    def getConcatenation(self, nums: List[int]) -> List[int]:\n        return nums*2\n```\n\n# 2. Java Solutions\n```\nclass Solution {\n    public int[] getConcatenation(int[] nums) {\n        int size=nums.length;\n        int[] list1=new int [2*size];\n        for(int i=0;i<size;i++){\n            list1[i]=nums[i];\n            list1[i+size]=nums[i];\n        }\n        return list1;\n    }\n}\n```\n# 3. Golang Solution\n```\nfunc getConcatenation(nums []int) []int {\n    n:=len(nums)\n    list1:=make([]int,n*2)\n    for i:=0 ;i<2*n;i++ {\n        list1[i]=nums[i%n]\n    }\n    return list1\n    \n}\n```\n# 4. Golang Solution Different Approach\n```\nfunc getConcatenation(nums []int) []int {\n    n:=len(nums)\n    list1:=make([]int,n*2)\n    for i:=0 ;i<n;i++ {\n        list1[i]=nums[i]\n        list1[i+n]=nums[i]\n    }\n    return list1\n    \n}\n```\n# 5. One Line of Golang Solution\n```\nfunc getConcatenation(nums []int) []int {\n    return append(nums,nums...)\n    \n}\n# please upvote me it would encourage me alot\n
['Java', 'Go', 'Python3']