Figure 4: Flips a ! a0 and b ! b0 accompanied by two ’phason’ singularities (or mismatches) of opposite signs. The two singularities can diffuse apart along the row of hexagons by a sequence of local flips. Adapted from Fig. 3 in [9].

Figure 4: Flips a ! a0 and b ! b0 accompanied by two ’phason’ singularities (or mismatches)
of opposite signs. The two singularities can diffuse apart along the row of hexagons by a sequence
of local flips. Adapted from Fig. 3 in [9].

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