In addition to the Dean and canons, there are at present two full-time minor canons, one is precentor, and the other is sacrist. The office of Priest Vicar was created in the 1970s for those who assist the minor canons. Together with the clergy and Receiver General and Chapter Clerk, various lay officers constitute the college, including the Organist and Master of the Choristers, the Registrar, the Auditor, the Legal Secretary, the Surveyor of the Fabric, the Head Master of the choir school, the Keeper of the Muniments and the Clerk of the Works, as well as 12 lay vicars, 10 choristers and the High Steward and High Bailiff.

How many lay vicars are there?