diff --git a/alib2data/src/grammar/Regular/LeftLG.cpp b/alib2data/src/grammar/Regular/LeftLG.cpp
index 29db7f37bcdb2550af219ee3b00b4c433197a867..f3ca2543909acbe1d2bc5673a80dbdc780a5b71d 100644
--- a/alib2data/src/grammar/Regular/LeftLG.cpp
+++ b/alib2data/src/grammar/Regular/LeftLG.cpp
@@ -33,9 +33,6 @@ GrammarBase* LeftLG::plunder() && {
 
 bool LeftLG::removeTerminalSymbol(const alphabet::Symbol& symbol) {
 	for(const std::pair<alphabet::Symbol, std::set<std::variant<std::vector<alphabet::Symbol>, std::pair<alphabet::Symbol, std::vector<alphabet::Symbol>> >> >& rule : rules) {
-		if(rule.first == symbol)
-			throw GrammarException("Symbol \"" + (std::string) symbol.getSymbol() + "\" is used in rule.");
-
 		for(const std::variant<std::vector<alphabet::Symbol>, std::pair<alphabet::Symbol, std::vector<alphabet::Symbol>> >& rhsTmp : rule.second)
 			if(rhsTmp.is<std::vector<alphabet::Symbol>>()) {
 				const std::vector<alphabet::Symbol>& rhs = rhsTmp.get<std::vector<alphabet::Symbol>>();
diff --git a/alib2data/src/grammar/Regular/LeftRG.cpp b/alib2data/src/grammar/Regular/LeftRG.cpp
index 1e497fd0101e46c0a37a4abe1120c5540489b9e1..3c04fdb46eba5eb7917f450cc1c4da982d733c02 100644
--- a/alib2data/src/grammar/Regular/LeftRG.cpp
+++ b/alib2data/src/grammar/Regular/LeftRG.cpp
@@ -110,7 +110,7 @@ bool LeftRG::operator==(const GrammarBase& other) const {
 }
 
 bool LeftRG::operator==(const LeftRG& other) const {
-	return this->nonterminalAlphabet == other.nonterminalAlphabet && this->terminalAlphabet == other.terminalAlphabet && this->initialSymbol == other.initialSymbol && this->rules == other.rules;
+	return this->nonterminalAlphabet == other.nonterminalAlphabet && this->terminalAlphabet == other.terminalAlphabet && this->initialSymbol == other.initialSymbol && this->rules == other.rules && this->generatesEpsilon == other.generatesEpsilon;
 }
 
 void LeftRG::operator>>(std::ostream& out) const {
@@ -119,6 +119,7 @@ void LeftRG::operator>>(std::ostream& out) const {
 			<< "terminalAlphabet = " << terminalAlphabet
 			<< "initialSymbol = " << initialSymbol
 			<< "rules = " << rules
+			<< "generatesEpsilon = " << generatesEpsilon
 			<< ")";
 }
 
diff --git a/alib2data/src/grammar/Regular/RightLG.cpp b/alib2data/src/grammar/Regular/RightLG.cpp
index a124a0151a299a218c8ecc0502472f2798d4df35..1ba4a09b658b153c11f003f3ff85ed7b323553d5 100644
--- a/alib2data/src/grammar/Regular/RightLG.cpp
+++ b/alib2data/src/grammar/Regular/RightLG.cpp
@@ -33,9 +33,6 @@ GrammarBase* RightLG::plunder() && {
 
 bool RightLG::removeTerminalSymbol(const alphabet::Symbol& symbol) {
 	for(const std::pair<alphabet::Symbol, std::set<std::variant<std::vector<alphabet::Symbol>, std::pair<std::vector<alphabet::Symbol>, alphabet::Symbol> >> >& rule : rules) {
-		if(rule.first == symbol)
-			throw GrammarException("Symbol \"" + (std::string) symbol.getSymbol() + "\" is used in rule.");
-
 		for(const std::variant<std::vector<alphabet::Symbol>, std::pair<std::vector<alphabet::Symbol>, alphabet::Symbol> >& rhsTmp : rule.second)
 			if(rhsTmp.is<std::vector<alphabet::Symbol>>()) {
 				const std::vector<alphabet::Symbol>& rhs = rhsTmp.get<std::vector<alphabet::Symbol>>();
diff --git a/alib2data/src/grammar/Regular/RightRG.cpp b/alib2data/src/grammar/Regular/RightRG.cpp
index c185eb08b973b4335e531dc1aa0b8031feea4cd0..1091151e9e72c10fb173f9961abf2b15c35c31f5 100644
--- a/alib2data/src/grammar/Regular/RightRG.cpp
+++ b/alib2data/src/grammar/Regular/RightRG.cpp
@@ -110,7 +110,7 @@ bool RightRG::operator==(const GrammarBase& other) const {
 }
 
 bool RightRG::operator==(const RightRG& other) const {
-	return this->nonterminalAlphabet == other.nonterminalAlphabet && this->terminalAlphabet == other.terminalAlphabet && this->initialSymbol == other.initialSymbol && this->rules == other.rules;
+	return this->nonterminalAlphabet == other.nonterminalAlphabet && this->terminalAlphabet == other.terminalAlphabet && this->initialSymbol == other.initialSymbol && this->rules == other.rules && this->generatesEpsilon == other.generatesEpsilon;
 }
 
 void RightRG::operator>>(std::ostream& out) const {
@@ -119,6 +119,7 @@ void RightRG::operator>>(std::ostream& out) const {
 			<< "terminalAlphabet = " << terminalAlphabet
 			<< "initialSymbol = " << initialSymbol
 			<< "rules = " << rules
+			<< "generatesEpsilon = " << generatesEpsilon
 			<< ")";
 }