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An orthography based on a correspondence to phonemes may sometimes lack characters to represent all the phonemic distinctions in the language. This is called a defective orthography. An example in English is the lack of any indication of stress.[citation needed] Another is the digraph |th|, which represents two different phonemes (as in then and thin) and replaced the old letters |ð| and |þ|. A more systematic example is that of abjads like the Arabic and Hebrew alphabets, in which the short vowels are normally left unwritten and must be inferred by the reader.