class Solution {
    public List<List<Integer>> minimumAbsDifference(int[] arr) {
        Arrays.sort(arr);
        int diff = Integer.MAX_VALUE;
        
        for(int i=0; i<arr.length-1; i++)
            diff = Math.min(diff, arr[i+1] - arr[i]);
        
        List<List<Integer>> list = new ArrayList<>();
        
        for(int i=0; i<arr.length-1; i++){
            if(diff == arr[i+1] - arr[i]){
                List<Integer> sublist = new ArrayList<>();
                sublist.add(arr[i]);
                sublist.add(arr[i+1]);
                list.add(sublist);
            }
        }
        
        return list;
    }
}