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In page Symbian Software:
"Symbian Ltd wanted the system to have different user interface layers, unlike Microsoft's offerings. Psion originally created several interfaces or "reference designs", which would later end up as Pearl (smartphone), Quartz (Palm-like PDA), and Crystal (clamshell design PDA). One early design called Emerald also ended up in the market on the Ericsson R380.[citation needed]
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