17a early form of sonar from acronym ?s?i? 28a alphabet from old horn books preceded by a religious symbol ?h?i?t/?r?s?/??w 3d member of people of rwanda and burundi ?u?s? 11d italian mountain troops ?l?t?i 19d iranian sect practising a modern version of zoroastrianism ?h?b?? 27d substances derived from petrochemicals used for sweetening agents c?c?a?a?e? thanks in advance