Question about inheritance

[signal jacinth]

Given the following Java source code:

O o = new O();
X x = new X();
T t = new T () ;
M m = new M () ;

The following assignments are all LEGAL (they can be translated):

m = t m = x o =t:

The following assignments are all ILLEGAL (they lead to translation errors):

o = m; o = x x = o ;

Question: What are the inheritance relationships between these classes?

[fading mica]

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[lethal oracle]

What are your thoughts and why do you have difficulties with it?

[signal jacinth]

I'm a java beginner and i'm not sure my solution is right: Class M is a superclass of classes O and X. Class T is a subclass of class O.
What you think?

[lethal oracle]

looks good to me

[short fossil]

alert: i might be retarded

O extends M, T extends O

disregard everything

  M
 / \
O   X
|
T

(deleted the previous solution i posted because it was wrong)