In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Q: Passage: On 4 May 1918, in the aftermath of the Finnish Civil War, Silatch arrived secretly in Kotka, Finland, to evacuate remaining members of the Finnish Red Guard. However, she was confiscated by the Finns and joined the Finnish icebreaker fleet as Ilmarinen, after the legendary hero from Kalevala. In December 1919 she was sent to Koivisto to assist three Finnish torpedo boats, C1, C2 and C3 that had been surrounded by ice some thick. The 150-ton torpedo boats had participated in the British campaign in the Baltic, and Admiral Walter Cowan had demanded that the Finnish squadron patrolling the area had to stay until the British forces had withdrawn. Despite the efforts of Ilmarinen, the weak-hulled torpedo boats were crushed by the ice, and the newly founded Finnish Navy lost one fifth of its ships. After the winter of 1919 Ilmarinen was laid up until she was returned to the Soviet Union according to the Treaty of Tartu. In turn the Soviets gave back the Finnish icebreaker Avance. The name Ilmarinen was later given to a Finnish coastal defence ship launched in 1931.
 Link Information: The treaty confirmed that the Finnish-Soviet border would follow the old border between the autonomous Grand Duchy of Finland and Imperial Russia.  Question: WHich countries participated in the Treaty that returned Silatch to the Soviet Union?

A: Answer: Russia
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Q: Passage: Duan Ju was born in Tianjin. At the age of 17, he was called up to China youth football team. Duan Ju played for Tianjin football Team 2 from 1980 to 1983. From 1984 to 1991, Duan Ju played for Tianjin. In 1988, Duan Ju played for China in the 1988 Asian Cup and football match at the 1988 Olympic Games. In 1990, China lost to Thailand in football match at the 1990 Asian Games. The coach of China, Gao Fengwen quit office， then Duan Ju quit the China national team and returned to Tianjin. in 1992, Duan Ju had gone to Japan and played for NKK SC. In 1993, Duan Ju retired in Japan and returned to China. In 1995, Duan Ju played for Tianjin Yuancheng football club, in the same year， Duan Ju retired again.
 Link Information: none Question: What coach did Duan Ju play for on the Japanese team?

A: Answer: none
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Q: Passage: The band's performance at WTTW's Grainger Studio in Chicago, taped on December 10, 2015, aired on the PBS concert series Soundstage on January 26, 2017, containing the new songs "My Monster" and "Gravity". "Fun" was released on February 1, 2017, as the album's lead single. On February 8, 2017, it was announced that Blondie will join Garbage on the co-headlining "Rage and Rapture Tour" across the United States, which will kick off on July 5 in Saratoga, California, wrapping up on August 12 in Dallas, Texas. A second track, "My Monster", was released as an iTunes instant grat, and made available to those who had pre-ordered the album, on February 19, 2017. "Fun" became Blondie's most successful single in years, rising to Number 1 on Billboard's Dance Club Songs (Blondie's first appearance on that chart since 1995) and many charts in other countries.
 Link Information: The band consists of Scottish singer and musician Shirley Manson and American musicians Duke Erikson, Steve Marker, and Butch Vig. All four members Question: How many members comprise the music group that Blondie announced it would join on the "Rage and Rapture Tour"?

A:
Answer: four
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