How to use i18n Pluralization?

Question

Internationalization and localization

hello how do i use vue 3 i18n pluralization
example

setup() {
    const { t, tc } = useI18n({});
    return { t, tc };
  },

but I get TypeError: _ctx.tс is not a function, just t works
Can I ask for an example i18n pluraliration vue 3 please