2.1.1 [Ruby:2001] Section 2.4, The rtc element


The specification states:

 The rtc (ruby text container) element serves as the container for rt elements in 
 the case of complex ruby markup. One or two rtc elements may appear inside a ruby 
 element to associate ruby texts with a single base text, represented by an rbc 
 element. More than two rtc elements MUST NOT appear inside a ruby element.

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All rtc elements within ruby elements are displayed.