The converse does not hold: for instance, an RS of the form R 1 (R 2 (p 1 p 2 ) p 3 ) can be realized by a paragraph of three sentences, one for each proposition, even though this TS contains no node dominating the propositions (p 1 and p 2 ) that are grouped by R 2 .
when this happens, the propositions grouped together in the RS must remain consecutive in the TS solutions in which p 3 comes inbetween p 1 and p 2 are prohibited.