Section 101(ix) in The Indian Succession Act, 1925
(ix)A, by his Will, bequeaths to B the sum of 5,000 rupees and also bequeaths to him the sum of 5,000 rupees if he shall attain the age of 18. B is entitled absolutely to one sum of 5,000 rupees, and takes a contingent interest in another sum of 5,000 rupees.