What are at least four coincidences in Great Expectations which must be accepted by the reader in order for the story to be believed?

It is a coincidence that Molly is Estella's true
mother.

It is a coincidence that the convict who Pip helped
as a child is his true benefactor.

It is a coincidence that
Orlick eventually works at the gate for Miss Havisham.

It
is a coincidence that Magwitch turns out to be Estella's
father.

It is a coincidence that Compeyson turns out to be
the man that left Miss Havisham at the altar.

Look at all
these people - they, just like Pip had GREAT EXPECTATIONS
for life. Havisham wanted a successful marriage. Molly and Magwitch probably wanted to
have children under good circumstances. Magwitch wanted to be a successful businessman.
ALL OF THEM WERE LET DOWN. Thus, the GREAT, as in big or tremendous. Expectations are
often hopes that never get met. They are ideas. They do not necessarily achieve
purposes.

Pip always hopes for something more, even until
the very end. As he finds Orlick at the door he feels like this man goes wherever he can
to mess with Pip's life.

I think one of Dicken's purposes
you can use is the fact that life doesn't always turn out the way we want. This is the
lesson to take home for each of the characters mentioned above. When you take a look at
the web woven for us, you see how closely linked all the manipulation was that made
these people's hopes be nothing more than that, hope.