[Grammar] a beginning/ beginnings

[mamen]

Teachers,
Is this grammatically correct?
Some stories don't have a clear beginning.

Or should it be "Some stories don't have clear beginnings."?

Thanks.

 

[bhaisahab]

Both are OK.

 

[mamen]

Both are OK.

Do they mean the same?

 

[Tarheel]

I don't see how it's possible for them not to mean the same thing.