Alignment improved 2 months later (Fig.11, 05/24/2014).  What do you find in this photo?

Jenny' s answer: Tooth 10 (and #11 at least edge to edge) and lower teeth have cross-bite relationship.  That is why the "labial step out" segment involves the two teeth.

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Xin Wei, DDS, PhD, MS 1st edition 08/14/2014, last revision 08/16/2014