"""スィ"" and ""ズィ"" is /si/ and /zi/, not /swi/ and /zwi/ == 

 According to the reference No.8, ""スィ"" is pronounced as /si/[si], not /swi/[sʷi].   
 Row S column i is occupied by ""シ(/shi/[ɕi]),"" so they use another way to represent /si/. 
 So do its dakuten version ""ズィ""/zi/[zi].    
 :Fixed.—   

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