Notes :A very interesting isogloss between Khoe and Sandawe, made a little suspicious by the fact that all other numeric parallels between these languages are either highly questionable ('one', 'two') or non-existent. On the other hand, there is no reason to attribute this to contacts between Khoe and Sandawe speakers, which are not documented; at best one could think of a common substrate - but such a substrate has not been found either (the numeral is unknown to any Niger-Congo or Nilo-Saharan speakers).
Notes :Initial *c- in Khoe is most probably a former class prefix, as seen from the opposing form *s-á (fem., where *s- = *-s in the general feminine marker for nouns.) Much more problematic is the Sandawe stem, where the main emphasis is on the *-pV part (which also functions separately in verbal forms as the regular marker for the 2nd p. sg.), while initial ha- has been tentatively associated (e. g. by O. Dempwolff) with the deictic stem *ha- 'that'. However, given the similarity of Sandawe 1st p. pronouns with Khoe, it cannot be excluded that ha- is, in fact, the primary marker here.