nums = [1,2,6,6,6,10,14,14,14]
#retuen[1,2,6,10,14]

#hashset

// 1. iterate through array
   2. use hashtable 

{1,2,3,3,4}

    //numsToReturn{1,2,3,4}
    //hashtes{1,2,3,4} built it array
    }
}




