class C0
{};
class C1
: public C0
{};
class C2
: public C1
, virtual public C0
{};
class C3
: public C1
, public C2
, virtual public C0
{};
class C4
: virtual public C1
, virtual public C0
, virtual public C3
, public C2
{};
class C5
: public C3
, virtual public C0
, virtual public C2
{};
class C6
: public C1
, public C2
, virtual public C5
, virtual public C3
, virtual public C0
{};
class C7
: public C1
, virtual public C5
, virtual public C4
, virtual public C2
, virtual public C0
, virtual public C6
{};
class C8
: virtual public C4
, public C3
, public C0
, virtual public C7
, virtual public C6
{};
class C9
: virtual public C0
, public C4
, public C8
, public C1
, public C6
{};
main() {
C0 c0;
C1 c1;
C2 c2;
C3 c3;
C4 c4;
C5 c5;
C6 c6;
C7 c7;
C8 c8;
C9 c9;
}