just because it seems obligatory 
(ROOT (SBAR (ADVP (RB just)) (IN because) (S (NP (PRP it)) (VP (VBZ seems) (S (ADJP (JJ obligatory)))))))
(ROOT (SBAR (ADVP (RB )) (IN ) (S (NP (PRP )) (VP (VBZ ) (S (ADJP (JJ )))))))