Mexican 2D 
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An opening of 2D shows a balanced hand of 19-21 that may have a weak
five card major.  Responder responds as follows

0-4: 	pass 	with diamonds
	2H	transfer to 2S over which responder may pass, or signoff
		in clubs or hearts
	2S	transfer to 2NT

5-6: 	2H	transfer to 2S, and the responder bids 2NT 

7+:	2S	transfer to 2NT and then raise to 3NT showing balanced 7-9
	2NT	shows balanced 10+
	3x	shows 10+ and a broken suit