Cats are one of the most beautiful subspecies of wildlifeCats are one of the most beautiful subspecies of wildlife
A musical group of five people, four at the sofa and one at the postA musical group of five people, four at the sofa and one at the post
Three people are sitting on the couch and one is standing behind himThree people are sitting on the couch and one is standing behind him
Без других, в отдельности. Тот же самый, тожественный. Единый, целостный. Число, цифра и количество 1. Какой-то, некий. Только, исключительно. Какой-нибудь в ряду сходных.