<Ul> <Li> Avestan 4 c . CE </Li> </Ul> <Li> Avestan 4 c . CE </Li> <Li> Palmyrene 2 c . BCE </Li> <Li> Syriac 2 c . BCE <Ul> <Li> Nabataean 2 c . BCE <Ul> <Li> Arabic 4 c . CE <Ul> <Li> N'Ko 1949 CE </Li> </Ul> </Li> </Ul> </Li> <Li> Sogdian 2 c . BCE <Ul> <Li> Orkhon (old Turkic) 6 c . CE <Ul> <Li> Old Hungarian c. 650 CE </Li> </Ul> </Li> <Li> Old Uyghur <Ul> <Li> Mongolian 1204 CE </Li> </Ul> </Li> </Ul> </Li> </Ul> </Li>

Who were the phoenicians which is their contribution to writing systems