👉 In mathematics, a "flankwise" is an element that appears in a list or sequence of elements. For example, if you have a list [1, 2, 3, 4, 5], and you want to find the first non-repeating element, you could use a loop like this: ``` for i in range(len(list)): if list[i] not in set([list[j] for j in range(i+1,len(list))]): print
