Actually David, I use "keris" as the plural form also. I probably should use "kris" as the correct English spelling, but I'd sooner not. However, as Jean has said,  a lot of keris-literate writers in English use "kerises" or "krises". In any case, we can always get around the problem with sentence construction.
		 
		
		
		
		
		
		
		
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