The areal form is used when the possessor is saliently areal, spatial, or an extent of time. The reflexive is used when the subject of the clause and the possessor are the same, whether singular or plural. The disjoint form is used when both subject and possessor are third person singular and are not the same. The plural disjoint form is used when the subject is third person plural, the possessor is third person singular, and the possessor is not one of the individuals in the subject group. The reciprocal form, meaning "each other's", was used into the early twentieth century but has since fallen out of use.