Ear Audio Auditory Consciousness
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sgra is sound, and you should recognize the genitive particle now, as a well as khams, so this is the sound element (shabda-dhatu.)
rna ba'i rnam par shes pa is auditory consciousness so this is the auditory consciousness element (srotra-vijnana-dhatu).
Does the pattern start to look familiar? We will go through the five + one more sense when dealing with the eighteen elements.