CREATE TABLE table_61935 ("Summoned" TEXT, "Elected" TEXT, "Assembled" TEXT, "Dissolved" TEXT, "1st member" TEXT, "2nd member" TEXT)

What is the assembled date of the parliament with an unknown 2nd member who was elected in 1482/83?
SELECT "Assembled" FROM table_61935 WHERE "2nd member" = 'unknown' AND "Elected" = '1482/83'
SELECT "Assembled" FROM "table_61935" WHERE "2nd member" = 'unknown' AND "Elected" = '1482/83'