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The two inserts can be incoperated in construction by one step or by two steps. Anyhow, one enzyme digestion on insert and backbone cannot guarantee the inserts are right combination and in right direction. So chance of successful  will be very small. No matter if the size of inset and backbone. Experiment design must be make sure each step is working and then can continue to the next. Otherwise it only waste money and time. Even money is not yours but it is your time .
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