<Li> Phonology: Sound laws, Accent, Ablaut </Li> <Dl> <Dt> Hypothetical </Dt> </Dl> <Ul> <Li> Daco - Thracian </Li> <Li> Graeco - Armenian </Li> <Li> Graeco - Aryan </Li> <Li> Graeco - Phrygian </Li> <Li> Indo - Hittite </Li> <Li> Italo - Celtic </Li> <Li> Thraco - Illyrian </Li> </Ul> <Li> Daco - Thracian </Li>

Which of the following does not apply to celtic languages