Learning how to perform this trick backwards (from index/middle slot to the middle/ring slot) is a good idea too, because you can then perform this trick back-and forth continuously.
The back-and-forth continues for weeks.
The back and forth continued.
So the shuttling back and forth continues.
He might pace back and forth endlessly.
Even though the clusters persisted for hours, individual proteins did not stay in a given cluster for long and instead continuously exchanged back-and-forth between the cluster and its surroundings.
There is back-and-forth on this.
It's a back-and-forth conversation.
I find myself constantly going back and forth on schools and continuously debating the pros and cons of each one.
As the pendulum moves, energy is continuously passing back and forth between the two forms.
Each person, working his way back and forth through his social network, almost continuously reviews past experiences while imagining the consequences of future scenarios.
