interface LoA{
}

class EmptyLoA implements LoA{
  EmptyLoA(){
  }
}

class ConsLoA implements LoA{
  
  Animal first;
  LoA rest;
  
  ConsLoA(Animal first, LoA rest){
    this.first = first;
    this.rest = rest;
  }
}

interface Animal{
}

class Bear implements Animal{
  
  String name;
  String eats;
  int weight;
  
  Bear(String name, String eats, int weight){
    this.name = name;
    this.eats = eats;
    this.weight = weight;
  }
}

class Snake implements Animal{
  
  String name;
  int length;
  boolean poisonous;
  
  Snake (String name, int length, boolean poisonous){
    this.name = name;
    this.length = length;
    this.poisonous = poisonous;
  }
}

class Spider implements Animal{
  
  String name;
  int legs;
  boolean poisonous;
  
  Spider(String name, int legs, boolean poisonous){
    this.name = name;
    this.legs = legs;
    this.poisonous = poisonous;
  }
}

class Examples{
  
  Examples(){
  }
  
  Animal spidy = new Spider("Spidy", 8, false);
  Animal smoky = new Bear("Smoky", "rodents", 1200);
  
  LoA empty = new EmptyLoA();
  LoA oneAni = new ConsLoA(this.spidy, this.empty);
  LoA threeAni = new ConsLoA(this.spidy, 
                             new ConsLoA(this.smoky,
                                         new ConsLoA(new Snake("Slim", 20, true), this.empty)));  
}