"a same..." insted of "the same..."

[Haihao]

Hi,

I always a little hesitate when I want to use "a same..." insted of "the same". Could you tell me what the right time is for using "a same..."?

Thank you!

[Beeesneees]

Usually, you should use 'the same'.
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Cheers m' dears!

[Haihao]

Many thanks.

[Haihao]

How about this one?:

A doctor to a patient: You have two serious diseases. I can't let a same one occur twice in a month again.

[Beeesneees]

That should be 'I can't let the same one occur...' as far as I can see.
_________________
Cheers m' dears!

[Haihao]

I'd wonder if "the same one" sounds too definite as if the doctor knew which one could while "a same one" suggests whichever one as long as it's the same. But I may be very wrong.

[Beeesneees]

I think I understand what you're getting it, and can appreciate the logic behind it, but all the same I imagine that this would be a very rare occurrence.
_________________
Cheers m' dears!

[Haihao]

Thank you BN. I am made clearer.

[Beeesneees]

I'm glad one of us is! I think you've confused me more than I was when the conversation began! :-)
_________________
Cheers m' dears!

[Haihao]

:-). Sometimes I want a chaos for myself and would like a companion or shepherd to lead me out of it.