arc(r_0105_0002__cracks_r_0105_0003__down,r_0105_0001__Rab,arg0).
( (IP-MAT (NP-SBJ (NPR Rab;{Rab})) (VBP cracks;{crack}) (RP down;{down}) (PUNC .)) (ID 105_a_lob_a02))