A technique combines most of the advantages of both blue noise and clustering in generating a partially clustered aperiodic mask and using it in a dither array algorithm for halftoning, such that the amount of clustering can be modulated. The present invention applies various sources of energy, including radiofrequency, ultrasound, and microwave, to modify subcutaneous tissue while prevent damage to surface tissue. In operation the top flange rests on the top surface of the support post thereby supporting at least part of the weight of the superstructure. A print job is received from a sponsor computing device. Said preparation comprises a mixture of cationic microbiocides and non-ionic surfactants.