python data structures backtracking is form of recursion butit involves choosing only option out of any possibilities we begin by choosing an option and backtrack from itif we reach state where we conclude that this specific option does not give the required solution we repeat these steps by going across each available option until we get the desired solution below is an example of finding all possible order of arrangements of given set of letters when we choose pair we apply backtracking to verify if that exact pair has already been created or not if not already createdthe pair is added to the answer list else it is ignored def permute(lists)if list = return elsereturn for in permute( sfor in permute(list sprint(permute( [" "," "," "])print(permute( [" "," "," "])when the above code is executedit produces the following result[' '' '' '['aa''ab''ac''ba''bb''bc''ca''cb''cc'