We propose to replace the pseudo-distance in the dynamical language approach [5] by the chord distance or piecewise distance. We need to examine the effects of this replacement from the biological point of view. In order to do this, we evaluate the new distance metrics on four datasets, namely Dataset 1 of 109 complete genomes of prokaryotes and eukaryotes used in [11] , Dataset 2 of 34 prokaryote and chloroplast genomes used in [12] , Dataset 3 of mitochondrial genomes of 64 selected vertebrates used in [19] , and Dataset 4 of 62 complete genomes of alpha-proteobacteria used in [31] . (Note: Chan et al. [21] recently tested the chord distance with different denoising formulas on Dataset 2).