Often 'b' & 'p' are interchangeable, for example 'baggage' becomes 'pagas', 'lob' (to throw) becomes 'loopima'. The initial letter 's' is often dropped, for example 'skool' becomes 'kool', 'stool' becomes 'tool'.
What two letters can never be replaced with each other in Estonian?
{'text': "'b' & 'p'", 'answer_start': 6}