in the cutting edge, on the cutting edge, move the goalpost, move the goalposts, out from the loop, out of the loop, learn the rope, learn the ropes, fall behind of, fall behind, get left from behind, get left behind, take something in one’s strides, take something in one’s stride, a sharply learning curve, a steep learning curve, a tip of the iceberg, the tip of the iceberg, open a can of worm, open a can of worms, in front of the curve, ahead of the curve, a gap is opening between up, a gap is opening up

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