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... The second step is replacing the ball B(x 0 , r) by the subdomain ω. The used technique is the propagation of smallness, i.e constructing a sequence of balls chained along the curve (see Figure 1). • The last step is covering Ω by dividing Ω into two parts: The interior Ω 0 which can be covered by balls being strictly inside Ω and the neighbourhood of ∂Ω (see Figure 2). ...

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