standing, lying, or up high) of the Figure and the part prefix specifies its intrinsic orientation with respect to the Ground. The order of lexical elements is flexible and the Figure may be omitted, and in some cases the Ground may be affixed with the locative clitic nak=. Preliminary data on acquisition indicate that children do not fully master this construction until they are 10 or 11 years of age. Another interesting feature of these constructions is that, where such a reading is plausible, the mapping between Figure/Ground and grammatical relation is potentially reversible: <blockquote> Although the two sentence above differ as to whether the first-person or subject-persons is subject or object (and vice versa) each has the same potential interpretations, the resolution of the ambiguity depending crucially on context. Numerals and numeral classifiers Numerals below twenty are bound morphemes and must always be accompanied by a classificatory prefix indicating the type or measure of the noun being quantified. The use of a classificatory prefix, as opposed to a suffix, is typologically unusual. In all there are just over 30 classificatory prefixes, a few of which are illustrated below: {| |- |ča̰ːtin čḭʃkṵ ‘one man’|| || la̰ʔatin pa̰ʃnḭ ‘one pig’ || || ʔentin kḭwḭ ‘one stick’ || || paːtin ɬa̰mam ‘one pot’ |- |ča̰ːtṵ čḭʃkṵ ‘two men’|| || tantṵ pa̰ʃnḭ ‘two pigs’ || || ʔentṵ kḭwḭ ‘two sticks’ || || paːtṵ ɬa̰mam ‘two pots’ |- |ʔeɬatṵtun čḭʃkṵ ‘three men’|| ||tantṵtun pa̰ʃnḭ ‘three pigs’ || || ʔentṵtun kḭwḭ ‘three sticks’ || || paːtutun ɬa̰mam ‘three pots’ |- |ʔeɬata̰ːtḭ čḭʃkṵ ‘four men’|| || tanta̰ːtḭ pa̰ʃnḭ ‘four pigs’ || || ʔenta̰ːtḭ kḭwḭ ‘four sticks’ || ||paːta̰ːtḭ ɬa̰mam ‘four pots’ |- |ʔeɬakitsis čḭʃkṵ ‘five men’|| ||tankitsis pa̰ʃnḭ ‘five pigs’ || || ʔenkitsis kḭwḭ ‘five sticks’ || ||paːkitsis ɬa̰mam ‘five pots’ |- |ʔeɬačaːʃan čḭʃkṵ ‘six men’|| ||tančaːʃan pa̰ʃnḭ ‘six pigs’ || || ʔenčaːʃan kḭwḭ ‘six sticks’|| ||paːčaːʃan ɬa̰mam ‘six pots’ |- |ʔeɬatoxon čḭʃkṵ ‘seven men’|| || tantoxon pa̰ʃnḭ ‘seven pigs’ || || ʔentoxon kḭwḭ ‘seven sticks’ || || paːtoxon ɬa̰mam ‘seven pots’ |- |ʔeɬatsayan čḭʃkṵ ‘eight men’|| ||tantsayan pa̰ʃnḭ ‘eight pigs’ || || ʔentsayan kḭwḭ ‘eight sticks’ || || paːtsayan ɬa̰mam ‘eight pots’ |- |ʔeɬanaxaːtsa čḭʃkṵ ‘nine men’|| ||tanaxaːtsa pa̰ʃnḭ ‘nine pigs’ || || ʔenaxaːtsa kḭwḭ ‘nine sticks’|| || paːnaxaːtsa ɬa̰mam ‘nine pots’ |- |ʔeɬakaʍ čḭʃkṵ ‘ten men’|| || tankaʍ pa̰ʃnḭ ‘ten pigs’ || || ʔenkaʍ kḭwḭ ‘ten sticks’ || || paːkaʍ ɬa̰mam ‘ten pots’