Sort search results in order of relevance, where relevance =
a) better if 0 premises for intro or 1 premise for elim/dest rules
b) better if substitution size wrt to current goal is smaller
Only applies to intro, dest, elim, and simp
(contributed by Rafal Kolanski, NICTA)
%FIXME
%\chapter{Basic Concepts}\label{ch:basics}
%\section{The Isar proof language}
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%%% mode: latex
%%% TeX-master: "isar-ref"
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