Problem: Background: Tambo (fondly known as O. R.) was born on 27 October 1917 in the village of Nkantolo in Bizana in eastern Pondoland in what is now the Eastern Cape. His father, Mzimeni Tambo, was the son of a farmer and an assistant salesperson at a local trading store. Mzimeni had four wives and ten children, all of whom were illiterate. His mother, Mzimeni's third wife, was called Julia.
Context: During his early years with the ANC, Oliver Tambo was directly responsible for organizing active guerilla units. Along with his comrades Nelson Mandela, Joe Slovo, and Walter Sisulu, Tambo directed and facilitated several attacks against the apartheid state. One of the most notable of these attacks was the Church Street bombing on 20 May 1983, which resulted in the death of 19 civilians and the wounding of a further 217. In submissions to the TRC in 1997 and 1998, the ANC revealed that the attack was orchestrated by a special operations unit of the ANC's Umkhonto we Sizwe (MK), commanded by Aboobaker Ismail. Such units had been authorized by Oliver Tambo, the ANC President, in 1979. At the time of the attack, they reported to Joe Slovo as chief of staff, and the Church Street attack was authorized by Tambo.  The ANC's submission said that the bombing was in response to a South African cross-border raid into Lesotho in December 1982 which killed 42 ANC supporters and civilians, and the assassination of Ruth First, an ANC activist and wife of Joe Slovo, in Maputo, Mozambique. It claimed that 11 of the casualties were SAAF personnel and hence a military target. The legal representative of some of the victims argued that as they were administrative staff, including telephonists and typists, they could not be considered a legitimate military target.  Ten MK operatives, including Aboobaker Ismail, applied for amnesty for this and other bombings. The applications were opposed on various grounds, including that it was a terrorist attack disproportionate to the political motive. The TRC found that the number of civilians versus military personnel killed was unclear. South African Police statistics indicated that seven members of the SAAF were killed. The commission found that at least 84 of the injured were SAAF members or employees. Amnesty was granted by the TRC
Question: Were there any casualties?
Answer: resulted in the death of 19 civilians and the wounding of a further 217.

IN: Mary Mary are an American gospel duo composed of sisters Erica Atkins-Campbell and Trecina Atkins-Campbell. Formed in 1998, Mary Mary was launched into mainstream recognition following the release of their best-selling debut album, Thankful (2000), which contained the hit single "Shackles (Praise You)". Their followup album Incredible (2002), reached number one on the Top Gospel Albums chart. Their third album, Mary Mary (2005), which contains themes the public interpreted as a channel to the group's experience, contains the worldwide hits "Heaven", "The Real Party", and "Yesterday".

From 2007 to 2012, the Campbells both served as judges alongside Donnie McClurkin for a gospel music competition show on BET called Sunday Best.  On October 21, 2008 they released their fifth studio album, The Sound. The lead single, "Get Up," was released digitally via ITunes on July 15, 2008. Mary Mary's The Sound achieved great success in the mainstream market and sold over 37,000 copies in its first week, making it their best charting album to date. It debuted at number seven on the Billboard 200, number two on the US R&B Chart, and topped both gospel and country music charts. The album held the number one position on the Billboard's Gospel Album Chart for over six months since its release. Warryn Campbell produced the album and collaborated with many professionals: Kierra Sheard, David Banner, Marvin Winans, Daryl Coley, Andrae Crouch, The Rance Allen Group, Dorinda Clark Cole, Joe Ligon, Walter Hawkins, Tramaine Hawkins, and Karen Clark Sheard. In spring 2009, "God In Me" achieved crossover success by reaching number five on the R&B/Hip-Hop Chart and number one on the Hot Dance Club Play.  The duo, along with Warryn Campbell, were nominated at the 52nd Grammy Awards in the Best Gospel Song category for "God in Me", that same year Israel Houghton's song they were featured on, named "Every Prayer", was also nominated. The album won Mary Mary four Stellar Awards on January 16, 2010. They were invited to participate in the remake of "We Are The World" to benefit Haiti after the earthquake.

Did they win?

OUT: 

Background: Serebro (Russian: Serebro; English translation: Silver) (Stylized as SEREBRO) is a Russian girl group formed by their manager and producer Maxim Fadeev.
Context: Polina Favorskaya (Russian: Polina Favorskaia, born 21 November 1991 in Volgograd, Russia) was the replacement of Elena Temnikova, who was introduced 5 June 2014. Favorskaya announced she was leaving the group in August 2017, but continued performing with them until the end of 2017.  Anastasia Karpova (Russian: Anastasiia Karpova, born 2 November 1984 in Balakovo, Russia) was very interested in music since her early age, but dedicated herself to ballet. She was also attending singing classes and decided to pursue her singing career. Anastasia had replaced Lizorkina, after the latter announced her departure. She first had her debut with the group on their single "Like Mary Warner". Anastasia, along with Elena and Olga had recorded their second studio album Mama Lover, making it Karpova's first full-length studio album. Karpova decided to leave the group to pursue a solo career. The song "UGAR" was her last song with the group.  Marina Lizorkina (Russian: Marina Lizorkina, born 9 June 1983 in Moscow, Russia) entered the Contemporary Art University in Moscow at the age of sixteen. She used to sing in a choir, before she became the lead singer of the group "Formula". In 2004, they released a few singles for the series Obrechennaya Stat Zvezdoy. Lizorkina was the last to join Serebro, after she saw an Internet announcement.  Dasha Shashina (Russian: Dasha Shashina, born 1 September 1990 in Nizhny Novgorod, Russia) is the replacement of Anastasia Karpova, who began performing with the group in October 2013. Shashina left the group in March 2016 due to serious health issues and having to undergo two surgeries.  Elena Temnikova (Russian: Elena Temnikova, born 18 April 1985 in Kurgan, Russia) came to media prominence as a contestant on the Channel One talent show Star Factory in 2003. She was spotted by Maxim Fadeev, the main producer of Star Factory, and signed to his recording company Monolit Records. Although Temnikova released two disco singles, "Begi" and "Taina", she did not continue her solo career and joined Serebro instead. She married co-member of Star Factory Alexey Semenov; the two separated in 2007, before a settlement for divorce. She then had a brief conflict with Fedeev, after dating and subsequently leaving his brother. She currently resides in Moscow, Russia. On 15 May 2014 the official Serebro website reported that Elena had left the group due to ill health. She was replaced with Karpova who had left the band earlier the previous year until they find a replacement.
Question: What did Polina add for the group?
Answer: