sentences:  From A, diverging lines show branching descent producing new varieties, some of which become extinct, so that after ten thousand generations descendants of A have become distinct new varieties or even sub-species a10, f10, and m10.Similarly, the descendants of I have diversified to become the new varieties w10 and z10.The process is extrapolated for a further four thousand generations so that the descendants of A and I become fourteen new species labelled a14 to z14.