Terms containing two by two

Subject	English	German
gen.	two by two	zu zweit
stat.	two-by-two frequency table	"2 x 2"-Kontingenztafel
math.	two-by-two frequency table	Vierfeldtafel
math.	two-by-two frequency table	2 x 2-Tafel
stat.	two-by-two table	Vierfeldertafel