1----- <~dex2k\mod2to3.top> Model:  2**3 Design
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3Model:  2**3 Design
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5k = 3 factors
6n = 8 runs
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8Y = MU +
9    0.5*( B1*X1 + B2*X2 + B3*X3 +
10          B12*X1*X2 + B13*X1*X3 +
11          B23*X2*X3 +
12          B123*X1*X2*X3 )
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