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At right, a radical from the character lack which is from a pictograph of a yawning, gaping mouth. At left, the radical meaning can (as in, what?), used here to express the phonetic sound, KA, doubled, ie; KA-KA. This was the ancient Chinese equivalent of (TRA-)LA-LA, and it indicated singing. Also, from its literal meaning of emerge from the mouth, the radical for can may of reinfroced the idea of a gaping mouth and thus we get KA-KA from a wide open mouth: singing.