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\subsection{Valence Disproportionation: TlCsCl3}  \label{subsec:tlcscl3} \label{sec:tlcscl3}  $Ba_{1-x} K_x B iO_3$, is a famous high temperature superconductor, discovered in the later 80's.[ REF SLEITHGT AND CAVA]. Its parent compound,   BaBiO3, has a distorted