Speak too loudly, stand in the wrong place, and you're on the wrong side of it.
Once that light goes on, whatever they do, they're on their way to fly.
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But what is true is that the path we're on right now is unsustainable.
But we're on the verge of putting natural language understanding into many of these.
Now that's a thought to depress you if you're on the wrong side of 40.
"We're on the cusp of a recovery, " says Tony Dennis, executive vice president with City Center.
"When you're on the avenues, they're trying to get places, " he said of the holiday masses.
"Celebrities put out one face when they're on the big or small screen, " she says.
He trusts the ladies will watch out for one another once they're on the outside.
We're on budget, we're on track, and we have an ambition to deliver a great Games.
The Masai call this peak we're on, Africa's second-highest, "Erukenya" -- mountain of clouds.
Instead of an era of opportunity, we've had a "you're on your own" era.
And how do you determine who's good at it, and whether they're on the up-and-up?
We think we're on top of it now but it's not helped the performance.
Once we're on the trail, we can't help but wonder how it passed the test.
That's why we were confident in letting both of them know they're on the ballclub.
"We're on uncharted ground, playing these moves over a period of decades, " he says.
"You're on your own computer, in your own room, your own space, " Savill said.
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The supporters know we're on a roll and they're getting a lot of belief.
Let's not forget the new dock connector while we're on the subject of breaking traditions.
"You need to decide which side of the cross you're on, " he warns Ferris.
We're on the cusp of making it more affordable for those that do have it.
Start the college account once you're on track toward retirement and have paid off personal debts.
"When you're on such a short tour you can't afford to carry anyone, " said Hastings.
So our message to Mr Balls is simple - you're on the right track.
We can find nothing that indicates they're on the verge of making a bomb.
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We're faster on integer than they are, they're faster on floating point than we are.
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But it's not so easy when you lose a job and you're on unemployment.
When they do go back to work, they're on the job for fewer hours.
So I ask you for your understanding, for your forgiveness on this journey we're on.
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