[Q]: Sentence: The code previously permitted only single-bottom hydraulic cylinders. Question: Before the code change was enacted what was the only permitted hydraulic cylinder type?
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[A]: yes

[Q]: Sentence: It was originally used pure, but has since been superseded by Muntz metal. Question: What has pure copper been replaced with in the building of ships?
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[A]: yes

[Q]: Sentence: Rurik led the Rus' until his death in about 879, bequeathing his kingdom to his kinsman, Prince Oleg, as regent for his young son, Igor. Question: Who declared Kiev "The mother of Rus citis'?
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[A]:
yes