[XeTeX] List of ligatures in a font

[d fulano]

Is there an easy way to print all the ligatures in a font
that XeTeX will use, under the current font settings in the document?
 
Is there e.g., a test command to determine if "f" "i" will
be replaced by another glyph, rather than be printed 
seperately?

i.e., if the character/glyph codes of the input "fi" will
be effectively replaced by different ones in the output..


Thanks  


  		 	   		  
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