<s> """<STR_LIT>""" <EOL> class Error ( Exception ) : <EOL> """<STR_LIT>""" <EOL> pass <EOL> class OutOfNodesError ( Error ) : <EOL> """<STR_LIT>""" <EOL> pass <EOL> class OutOfInstancesError ( Error ) : <EOL> """<STR_LIT>""" <EOL> pass <EOL> class UnusableNodeError ( Error ) : <EOL> """<STR_LIT>""" <EOL> pass </s>
