6. The method of claim 5 , further comprising multiplying the relevancy score for each of the plurality of clips by a respective scaling factor, wherein the scaling factor is based on the printing difficulty of the corresponding clip or a probability distribution of printing difficulties.
5. The method of claim 1 , wherein in the case that the at least one relevancy criterion includes the printing difficulty, the plurality of clips includes a highest printing difficulty clip and a lowest printing difficulty clip, and the printing difficulty is calculated based on a critical dimension or a lithography difficulty estimator (LDE) of the clip.