deletions | additions       diff --git a/header.tex b/header.tex  index bd4c4b4..de195b2 100644  --- a/header.tex  +++ b/header.tex 
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\newcommand{\G}{{\bf G}}  \newcommand{\Atoms}{{\bf P}}  \newcommand{\Model}{\mathcal{M}}  \newcommand{\mo}{\text{\rm Mod}}  \renewcommand{\O}{{\bf O}}  \newcommand{\N}{N}