Assertion: primary sign language | /r/HasProperty | acquired alternative usages
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Source sentences:
text: Wittmann adds that this taxonmic criteron is not really applicable with any scientific rigor: Alternative sign languages, to the extent that they are full-fledged natural languages (and therefore included in his survey), are mostly used by the deaf as well; and some primary sign languages (such as ASL(ase) and ADS) have acquired alternative usages.