_:b61538751 _:b61538752 . _:b61538753 _:b61538754 . _:b61538750 _:b61538751 . _:b61538750 . _:b61538749 _:b61538750 . _:b61538750 _:b61538753 . _:b61538752 "2006-12-31"^^ . _:b61538754 "2006-01-01"^^ .