Input: Read this: One of the first demonstrations of the ability for telecommunications to help sign language users communicate with each other occurred when AT&T's videophone (trademarked as the "Picturephone") was introduced to the public at the 1964 New York World's Fair –two deaf users were able to communicate freely with each other between the fair and another city. Various universities and other organizations, including British Telecom's Martlesham facility, have also conducted extensive research on signing via videotelephony. The use of sign language via videotelephony was hampered for many years due to the difficulty of its use over slow analogue copper phone lines, coupled with the high cost of better quality ISDN (data) phone lines. Those factors largely disappeared with the introduction of more efficient video codecs and the advent of lower cost high-speed ISDN data and IP (Internet) services in the 1990s.
Question: What was introduced to make extensive research easier over video telephony?

Output: unanswerable


Input: Read this: To Kill a Mockingbird was Lee's only published book until Go Set a Watchman, an earlier draft of To Kill a Mockingbird, was published on July 14, 2015. Lee continued to respond to her work's impact until her death in February 2016, although she had refused any personal publicity for herself or the novel since 1964.
Question: What is the name of Lee's second published work?

Output: Go Set a Watchman


Input: Read this: The Constitution provides that "a regular Statement and Account of the Receipts and Expenditures of all public Money shall be published from time to time". That provision of the Constitution is made specific by Section 331 of Title 31 of the United States Code. The sums of money reported in the "Statements" are currently being expressed in U.S. dollars (for example, see the 2009 Financial Report of the United States Government). The U.S. dollar may therefore be described as the unit of account of the United States.
Question: What is the unit of report provisions of the United States?

Output: unanswerable


Input: Read this: Among the paleo-orthodox and emerging church movements in Protestant and evangelical churches, in which some Presbyterians are involved, clergy are moving away from the traditional black Geneva gown to such vestments as the alb and chasuble, but also cassock and surplice (typically a full length Old English style surplice which resembles the Celtic alb, an ungirdled liturgical tunic of the old Gallican Rite), which some, particularly those identifying with the Liturgical Renewal Movement, hold to be more ancient and representative of a more ecumenical past.
Question: What were some Celtics involved in?

Output:
unanswerable