Main effect plans fork n factorials with blocks

Some main effect plans for 3 n factorials

“…This property is not shared by the plans of Raktoe and Federer [5] and Dey and Saha [3]. However, the 'even' effects are correlated among themselves.…”

“…Let us denote the proposed plans as P,, those given by Raktoe and Federer [5] as P2 and those given by Dey and Saha [3] as P3. In fact, the plan P2 is a particular case of the plan P3.…”