If we use subscript letters to indicate coreference (so that two NPs with the same subscript refer to the same entity, whereas two NPs with differ- ent subscripts refer to different entities), then we can say that (19) is ambigu- ous as between the two interpretations represented in (20) below: (20) (i) The menᵢ will shoot the arrowsⱼ at each otherⱼ (ii) The menᵢ will shoot the arrowsⱼ at each otherᵢ
Source: wiktionary