, then by all means check it out . 
(ROOT (S (, ,) (ADVP (RB then)) (PP (IN by) (NP (DT all) (NNS means))) (VP (VB check) (NP (PRP it)) (PRT (RP out))) (. .)))
(ROOT (S (, ) (ADVP (RB )) (PP (IN ) (NP (DT ) (NNS ))) (VP (VB ) (NP (PRP )) (PRT (RP ))) (. )))