All ravens are black.
All non black THINGs are not ravens.
The term 'black' has a scope. The phrase 'non black THINGs' changes that scope to include all things; including a white shoe and leads to the conclusion that a white shoe supports the hypothesis "All ravens are black".
To beg the point,
All ravens are black ravens.
All non black/non ravens are not ravens.
The phrase 'non black non ravens' comes from complementing/negating 'black ravens' as a whole,
non(black ravens) = non black or non ravens
The term 'black' is limited/scoped to/around ravens. If your study is on raven then non-ravens should not concern you.
non(black ravens) = non black or non ravens \(\longrightarrow\) non black and raven \(\longrightarrow\) non black ravens
Happy paradox.
PS: Any logical operation(s) on any statement(s) should not provide more information.
