'Unless' in the Bible

Now I want you all to speak with tongues, but even more that you may prophesy. The one who prophesies [is] greater than the one who speaks with tongues, unless he interprets, in order that the church may receive edification.

But now, brothers, if I come to you speaking with tongues, how do I benefit you, unless I speak to you either with a revelation or with knowledge or with a prophecy or with a teaching?

And so you through the tongue, unless you produce a clear message, how will it be known what is spoken? For you will be speaking into the air.

by which you are also being saved, if you hold fast to the message I proclaimed to you, unless you believed to no purpose.

Foolish person! What you sow does not come to life unless it dies.