Rhoda, roaming free in a territory she hadn't explored before, spent some while orientating.

This is an idea he has explored before.

Winter had been interested in creating a series set in the 1920s, feeling that it had never properly been explored before.

This notion, too, has been explored before, often by cramming antlike behavior into bipedal bodies.

Minutes passed as his mind traveled back down all the dead avenues it had explored before.

So it's clear that the notion of this problem has been explored before.

Making it possible for businesses of all sizes to network, collaborate and essentially expand their services in avenues they might not have explored before.

You explore areas that haven't necessarily been explored before.

This subject has been explored before.

Do not suggest that the play, despite its ineffable sadness, represents a significant evolution of themes he has explored before, like unrequited love or mortality.