This task is about creating an unanswerable question based on a given passage. Construct a question that looks relevant to the given context but is unanswerable. Following are a few suggestions about how to create unanswerable questions:
(i) create questions which require satisfying a constraint that is not mentioned in the passage
(ii) create questions which require information beyond what is provided in the passage in order to answer
(iii) replace an existing entity, number, date mentioned in the passage with other entity, number, date and use it in the question
(iv) create a question which is answerable from the passage and then replace one or two words by their antonyms or insert/remove negation words to make it unanswerable.

Input: Consider Input: Passage: The best, worst and average case complexity refer to three different ways of measuring the time complexity (or any other complexity measure) of different inputs of the same size. Since some inputs of size n may be faster to solve than others, we define the following complexities:

Output: What are the three secondary expressions used to represent case complexity?

Input: Consider Input: Passage: Selenizza is a naturally occurring solid hydrocarbon bitumen found in the native asphalt deposit of Selenice, in Albania, the only European asphalt mine still in use. The rock asphalt is found in the form of veins, filling cracks in a more or less horizontal direction. The bitumen content varies from 83% to 92% (soluble in carbon disulphide), with a penetration value near to zero and a softening point (ring & ball) around 120 C. The insoluble matter, consisting mainly of silica ore, ranges from 8% to 17%.

Output: The soluble matter consists mainly of silica ore and ranges from what percentage?

Input: Consider Input: Passage: At the same time, naval innovations led to a German domination of trade in the Baltic Sea and parts of Eastern Europe through the Hanseatic League. Along the trade routes, Hanseatic trade stations became centers of the German culture. German town law (Stadtrecht) was promoted by the presence of large, relatively wealthy German populations, their influence and political power. Thus people who would be considered "Germans", with a common culture, language, and worldview different from that of the surrounding rural peoples, colonized trading towns as far north of present-day Germany as Bergen (in Norway), Stockholm (in Sweden), and Vyborg (now in Russia). The Hanseatic League was not exclusively German in any ethnic sense: many towns who joined the league were outside the Holy Roman Empire and a number of them may only loosely be characterized as German. The Empire itself was not entirely German either. It had a multi-ethnic and multi-lingual structure, some of the smaller ethnicities and languages used at different times were Dutch, Italian, French, Czech and Polish.
Output: What lead to the defeat of the Hanseatic League?