source: [lemma=□ | □] □ □
destination: [lemma=we | □] □ □
spec: " So that here we have perfect or even more than commonly perfect fertility , in a first cross between two distinct species . Note that all R syntax elements are treated in this way , e.g . As long as we do not have perfect and complete knowledge , our scientific models must be considered tentative , and valid only within the current limits of what we know . And now wide multicasting is not all there is but though one day it will arrive .