Languages of the Brythonic branch do not have dual number. As mentioned above for Middle Welsh, some nouns can be said to have dual forms, prefixed with a form of the numeral "two" (Breton , Welsh , Cornish ). This process is not fully productive, however, and the prefixed forms are semantically restricted. For example, Breton (< "hand") can only refer to one person's pair of hands, not any two hands from two different people. Welsh must refer to a period of two consecutive months, whereas can be any two months (compare “fortnight” in English as opposed to “two weeks” or “14 days”; the first must, but the second and third need not, be a single consecutive period).