static class T3<A, B, C> {
  A a;
  B b;
  C c;
  
  *() {}
  *(A *a, B *b, C *c) {}
  *(T3<A, B, C> t) { a = t.a; b = t.b; c = t.c; }
  
  public int hashCode() {
    ret _hashCode(a) + 2*_hashCode(b) - 4*_hashCode(c);
  }
  
  public bool equals(O o) {
    if (o == this) true;
    if (!(o instanceof T3)) false;
    T3 t = (T3) o;
    ret eq(a, t.a) && eq(b, t.b) && eq(c, t.c);
  }
  
  toString {
    ret "(" + quoteBorderless(a) + ", " + quoteBorderless(b) + ", " + quoteBorderless(c) + ")";
  }
}