circuit class HiF (use_layer  m1 via1 m2 )
circuit class HiF (priority 255)

circuit class HiZ (use_layer  lm lvia m3)
circuit class HiZ (priority 230)f



rule class_class HiF HiZ (tandem_segment (gap 2.2) (limit 20))
rule class_class HiF HiZ (parallel_segment (gap 5.2) (limit 20))



circuit class mid_priority (priority 230)
