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design_to_N(design)
d=matrix(c(1 , 4 , 6 , 5 , 6 , 7 , 3 , 4 , 5 , 2 , 4 , 7 , 1 , 3 , 7 , 2 , 3 , 6 , 1 , 2 , 5 ),nrow=7,byrow=TRUE) design_to_N(d)
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