4 constructor(<bold>n: Int</bold>, s: String = "???")
7 	class B1: A(<bold>1</bold>)
8 	class B2: A(<bold>1</bold>, "2")
9 	class B3: A(<bold>1</bold>, s = "2")
10 	class B4: A(n = <bold>1</bold>, s = "2")
11 	class B5: A(s = "2", n = <bold>1</bold>)
14 	A(<bold>1</bold>)
15 	A(<bold>1</bold>, "2")
16 	A(<bold>1</bold>, s = "2")
17 	A(n = <bold>1</bold>, s = "2")
18 	A(s = "2", n = <bold>1</bold>)
