private void InitializeProductionsByGrammarSymbolsInRightHandSide()
{
foreach (var v in Cfg.Variables.Concat(Cfg.GetNonVariableSymbols()).ToList())
{
productionsByGrammarSymbolsInRightHandSide[v] = new List <Production>();
}
foreach (var prod in Cfg.GetProductions())
{
foreach (var v in prod.Rhs.Distinct().ToList())
{
productionsByGrammarSymbolsInRightHandSide[v].Add(prod);
}
}
}