_:b21123 . _:b21516 . _:b21517 . _:b21518 . _:b21516 . _:b21512 . _:b21513 . _:b21514 . _:b21515 . . _:b21518 . _:b21513 . _:b21512 . "t2020_rn310_DSD" . _:b21515 . _:b21514 . _:b21517 . _:b21123 .