1. What are some ways to promote a company?
2. Trell has observed a sudden drop in prepaid orders. What could be the reason for the drop, and what precautions can be taken in the future to avoid such drops?
3. Write a Python code to check if the given sentence is a palindrome or not.
4. Find the Second Largest Element Given an array or list of integers 'ARR', identify the second largest element in 'ARR'. If a second largest element does not exist, return -1. Example: Input: ARR = [2, 4, 5, 6, 8] Output: 6 Explanation: In the sequence, 8 is the largest and 6 is the second largest. Input: ARR = [5, 5, 5, 5, 5] Output: -1 Explanation: There is no second largest element as all elements are identical. Constraints: 1 ≤ T ≤ 100 where 'T' is the number of test cases. 1 ≤ N ≤ 5000 where 'N' is the number of elements in 'ARR'. -10^9 ≤ ARR[i] ≤ 10^9 for each element in 'ARR'. Note: You do not need to print any output. Implement the function to return the desired results.