I want to know the answer to the following question:
Along with myrrh and spices, what important luxury did ancient Somali merchants provide?
All the background I'm provided with is that "Somali sailors and merchants were the main suppliers of frankincense, myrrh and spices, items which were considered valuable luxuries by the Ancient Egyptians, Phoenicians, Mycenaeans and Babylonians.". Is that enough to answer the question?