CREATE TABLE table_60923 ("Name a" CLOB, "Country" CLOB, "Office" CLOB, "Mandate start" CLOB, "Mandate end" CLOB, "Term length" CLOB)

When did Prime Minister Agathe Uwilingiyimana's mandate end?
SELECT "Mandate end" FROM table_60923 WHERE "Office" = 'prime minister' AND "Name a" = 'agathe uwilingiyimana'
SELECT "Mandate end" FROM "table_60923" WHERE "Name a" = 'agathe uwilingiyimana' AND "Office" = 'prime minister'