• .dsy:it.
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code:

X	A	B	Y	B	Z	B
-----------------	---------	---------
	a	1		1		2
	a	2		3		3
	a	3
	b	1
	b	2
	d	3
	c	1
	c	2
	c	3
	c	4


risultati di X/Y e X/Z

X/Y

A	B
---------
a
c


X/Z

A	B
---------
a
c