An e-reader application preserves formatting of a selection through a snippet. Example embodiments directed to scene reconstruction, reconstruct a 3D scene from a plurality of 2D images of that scene by first generating a model of the 3D scene from a subset a of the 2D images. The wall of the body comprises arms for supporting a lumen as well as regions which are selectively deformable during the expansion of the stent, the arms and the selectively deformable regions having different cross-sections andor cross-sectional areas. Students are taught to play either clef with either hand using musical pieces specifically designed to teach each note individually and in combination as it is added to the student’s repertoire. When the fault occurs in any one of the slave servers, the master server can perform fault recovery of a transaction in which the faulty server is involved.