"Nesting occurs when a market produces a series of five wave impulse moves in the direction of the trend, but the waves clearly overlap.This certainly fails to comply with normal Elliott Wave
requirements. However, instead of considering the action a failure or part of another correction, the proper count would be a series of 1-2-1-2's. Eventually, a powerful third wave develops, and then a group of finishing 4-5's are traced out to match the 1-2's and thus complete the five wave string."
-Steven W. Poser, Applying Elliott Wave Theory Profitably