You are given a string S. Your task is to print all possible combinations, up to size k, of the string in lexicographic sorted order.

Today marks the start of the second week, the "Standard Library Magician" series! We've been polishing our Python syntax so far, but from here on, we'll master the "convenient tools provided from the ...

For example, have you ever thought, "I want to process two separate lists as one big stream," or "I want to pair up lists of different lengths while filling in the missing parts"? You might have ...