tomokinakamaru/silverchain

import tripletbuilder.TripletBuilder;
import java.util.List;

TripletBuilder<;T> {

  List<T> { setFirst(T item), setSecond(T item), setThird(T item), } build();

  List<T> { setFirst(T item)?, setSecond(T item)?, setThird(T item)? } build();
}