How to convert ((a|b)|(a,b)) to XSD?

How to convert ((a|b)|(a,b)) to XSD?This code violates "Unique Particle Attribution" rule:\[code\]<xs:choice> <xs:choice> <xs:element ref="a"/> <xs:element ref="b"/> </xs:choice> <xs:sequence> <xs:element ref="a"/> <xs:element ref="b"/> </xs:sequence> </xs:choice>\[/code\]
 
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