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We may be finally beginning to understand these superconductors after two decades. The fly in the ointment is the lack of observation of electron and hole pockets in other measurements in hole-doped superconductors (in angleresolved photoemission spectroscopy, for instance) that are also capable of measuring Fermi surfaces [see, however, the work on electron- doped materials (11)]. Missing so far in experiments are also the higher frequency oscillations that must arise from the hole pockets, not just the electron pockets (4).