need help guys

class B { /* */ };
class D1: virtual B { /* */ };
class D2: virtual B { /* */ };
class D3: B { /* */ };
class D4: private B { /* */ };
class D5: virtual public B { /* */ };
class M1: D1, public D2, D3, private D4, virtual D5
{ /* i */ };
class M2: D1, D2, virtual D3, virtual D4, virtual D5
{ /* */ };
how many times is class B inherited in class M1 and M2\?
i understood that virtual public inheritance has priority from virtual private, and that i have:
a base class(B), two inherited virtual public(D1, D2), one let's say just public(D3), if i have a 4-th(M) class which inherited public form all of them(D1, D2, D3), this has two subobjects of class B(from D1 and D2) and one from D3,
but i don't understand this example which i posted here...please help