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2) Cuprates Chuck 101. EPL.  Qualitative Idea. Reducing the charge transfer gap, increase Tc in cuprate like structures.  a) DMFT to compute gap.  b) Local checks. In plane rotations. No global structural optmiziation.  c) Check some slices using reactions.  More work shows that that slices give a different picture.  Outcome : do any of these materials exist ?  3) Cuprates .Chuck 103. Hg .