7
Oliver Letwin is the son of William Letwin, Emeritus Professor at the London School of Economics, and conservative academic Shirley Letwin. Letwin was educated at Hall School  in Hampstead and Eton College. He went on to study at Trinity College, Cambridge. Whilst a student at Cambridge, he was an active member of the Cambridge University Liberal Club. When asked about his membership of the Liberal club he explained:
 education institution: Oliver Letwin, Hall School 
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: place of death, place of birth, education degree, education institution 
Text: {0} 
Answer:
 education institution: Oliver Letwin, Hall School 