Dominoes

 public static boolean hasChain(ArrayList<Domino> dominoes, int first, int second){//5,5
        boolean match = false;
        for(int i = 0; i < dominoes.size();i++){
            if((dominoes.get(i).first() == first && dominoes.get(i).second() == second) ||
                    (dominoes.get(i).first() == second && dominoes.get(i).second() == first)){
                match = true;
            }
        }
        if (match){
         return match;
        }
        else {
          for(int i = 0;i<dominoes.size();i++){
              if(dominoes.get(i).first()==first){
                  int other = dominoes.get(i).second();
                  ArrayList<Domino> copy = new ArrayList<>();
                  copy.addAll(dominoes);
                  copy.remove(copy.get(i));
                  if(hasChain(copy,other,second)){
                      return true;
                  }
              }
              else if(dominoes.get(i).second()==first){
                  int other = dominoes.get(i).first();
                  ArrayList<Domino> copy = new ArrayList<>();
                  copy.addAll(dominoes);
                  copy.remove(copy.get(i));
                  if(hasChain(copy,other,second)){
                      return true;
                  }
              }
          }
          return false;
        }

    }