question: Who is the maternal grandmother of Janusz The Younger?
context: [["Purnima (Hindi actress)", ["Purnima Das Verma( born Meherbhano Mohammad Ali) was an Indian film actress who worked predominantly in Hindi language films.", "She is the grandmother of actor Emraan Hashmi."]], ["Mona Hopton Bell", ["Mona Hopton Bell( 1867- 1940) was a British artist, best known for her portraits of civic figures.", "She was the grandmother of the painter Jean H. Bell."]], ["Danut\u0117 of Lithuania", ["Danut\u0117 of Lithuania (baptized \"Anna\"; ca.", "1358 \u2013", "26 November 1424), was a Lithuanian princess of the Gediminid dynasty and by marriage Duchess of Warsaw.", "She was a daughter of K\u0119stutis, Grand Duke of Lithuania, and his second wife Birut\u0117."]], ["Hannah Arnold", ["Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children."]], ["Diana Guardato", ["Diana Guardato was a member of the aristocratic Patrician Guardato family, and had three children with King Ferdinand I: Diana Guardato is the 16th- Great Grandmother of His Royal Highness Albert II of Belgium, 15th- Great Grandmother of His Majesty Juan Carlos", "I of Spain, 17th- Great Grandmother of Philippe of Belgium, 14th- Great Grandmother of His Majesty Manuel II of Portugal, 16th- Great Grandmother of Grand Duke Henri, as well as many others."]], ["Tjuyu", ["Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.", "She is the grandmother of Akhenaten, and great grandmother of Tutankhamun."]], ["Anne Denman", ["Anne Denman( 1587\u20131661) was born in Olde Hall, Retford, Nottinghamshire.", "Through a fortunate second marriage with Thomas Aylesbury, she became the grandmother of Lady Anne Hyde, Duchess of York and great- grandmother of Queen Mary II and Queen Anne."]], ["Hubba bint Hulail", ["Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic\" Nab\u012b\"( Prophet) Muhammad ibn Abdullah."]], ["Janusz the Younger", ["Janusz the Younger (pl: \"Janusz M\u0142odszy\"; 1376/81 - ca. 18 October 1422), was a Polish prince member of the House of Piast.", "He was the eldest son of Duke Janusz I of Warsaw and Danut\u0117 of Lithuania, a daughter of K\u0119stutis."]], ["Kaoru Hatoyama", ["After the elections of 2009, she became more widely known as the grandmother of Prime Minister Yukio Hatoyama and his politician brother Kunio Hatoyama."]]]
supporting_facts: [["Janusz the Younger", 1], ["Danut\u0117 of Lithuania", 3]]
evidences: [["Janusz the Younger", "mother", "Danut\u0117 of Lithuania"], ["Danut\u0117 of Lithuania", "mother", "Birut\u0117"]]
answer: Birutė