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78 PCB007 MAGAZINE I FEBRUARY 2022 steps were undertaken. ese four steps were (Figure 6): 1. Educate yourself on this new SAP technology and familiarize yourself with your fabricator's capability. 2. Create a test vehicle that permits reliabil- ity testing and can answer new questions about design rules and materials. 3. Redesign one of your most recent HDI or multilayer designs using the new ultra- HDI design rules you have been testing. Figure 5: CSM's density modeling algorithm 2 . Figure 6: Four steps on how to get started when risks are visible.