// if only part of the paragraphs will be outputed
if (runparams.par_begin != runparams.par_end) {
par = boost::next(paragraphs.begin(), runparams.par_begin);
// if only part of the paragraphs will be outputed
if (runparams.par_begin != runparams.par_end) {
par = boost::next(paragraphs.begin(), runparams.par_begin);