In instantiating the ImmutableString, the function pointers to the get and length methods actually refer to the String.get and String.length method, by going through the base variable which is an internally stored String object. The use of a function pointer can achieve inheritance of a method from a superclass.
Most women will start to show at some point between weeks 12 and 24 of pregnancy, with most reporting that they began to show during the first half of their second trimester, between 12 and 18 weeks.
Third prenatal appointment: Occurs between the 14th and 16th week of pregnancy. The second trimester begins at week 14 of your pregnancy. Around now you will hopefully begin to have more energy and less morning sickness. You may also start to appear pregnant.