Q: Does "In the ninth and tenth centuries, much authority was lost to the great families, who disregarded the Chinese-style land and tax systems imposed by the government in Kyoto." provide a valid answer to "The Emishi were defeated in what year?"?
A: no

Q: Does "Elemental hydrogen from solar, biological, or electrical sources require more energy to make it than is obtained by burning it, so in these cases hydrogen functions as an energy carrier, like a battery." provide a valid answer to "Where does the sun get its energy from?"?
A: no

Q: Does "Few predicted that attacks by night would force Londoners to sleep in shelters." provide a valid answer to "Why were Londoners forced to sleep in shelters?"?
A: yes

Q: Does "The Unicode Roadmap Committee (Michael Everson, Rick McGowan, and Ken Whistler) maintain the list of scripts that are candidates or potential candidates for encoding and their tentative code block assignments on the Unicode Roadmap page of the Unicode Consortium Web site." provide a valid answer to "Michael Everson, Rick McGowan, and Ken Whistler make up what group?"?
A:
yes