The first factor concerns our representation choice.
hence, to derive the rhetorical structure of text (4) it is sufficient to hypothesize with respect to the occurrence of the connective the exclusively disjunctive hypothesis rhet_rel(CONTRAST, 1, 3) (9 rhet_rel(CONTRAST, 1, 4) (9 rhet_rel(CONTRAST, 2, 3) (grhet_rel (coNTRAST,2,4), because this hypothesis subsumes all the other possible rhetorical relations that may be signaled by the connective.