The subject matter is quite vague.
Partly decomposed, partly formed earthy matter
The subject matter was not specified.
The subject matter is not specified.
It's a deeply intimate matter.
The subject matter was not defined.
The subject matter was left undefined.
A lethal chunk of metallic matter
Essentially, elaborate on the given subject matter.
The subject matter is shrouded in mystery.
The user is silent on this matter.
The subject matter is human beings.
The subject matter is void of description.
Chess for All – Every Moment Matters
He's the man, what else matters?
He loves u no matter what!
Roof tiles. ...Size doesn't matter
Protector of Matter from Final Fantasy VII
The subject matter is being examined.
The subject matter is a mystery.
The subject matter was left unidentified.
Here's my take on the matter.
Crafted in a Matter of Moments.
