fix computation of raw rules in EpsilonFreeCFG

alib2algo/src/grammar/simplify/ToCNF.cpp

@@ -71,8 +71,7 @@ grammar::CNF < > convertInternal( const T & origGrammar ) {
 			else if(origRhs.size() > 2) {
 				auto second = splitToPairs(grammarTmp, origRhs, 0, origRhs.size(), createdSymbols);
 				grammarTmp.addRawRule(origRule.first, {std::move(second.first), std::move(second.second)});
-			} else
-				throw exception::CommonException("Invalid rule in grammar");
+			}
 		}
 	}

alib2data/src/grammar/ContextFree/EpsilonFreeCFG.h

@@ -409,7 +409,7 @@ ext::map < SymbolType, ext::set < ext::vector < SymbolType > > > EpsilonFreeCFG
 	if ( getGeneratesEpsilon ( ) )
 		res [ getInitialSymbol ( ) ].insert ( ext::vector < SymbolType > { } );
-	return rules;
+	return res;
 }
 template < class SymbolType >