.subckt CD4015BC_edge clkb qb4 qa3 qa2 qa1 ra da ? clka qa4 qb3 qb2 qb1 rb db ?
.include dff_edge.sub
x1 da clka qa1 ra dff_edge
x3 qa1 clka qa2 ra dff_edge
x5 qa2 clka qa3 ra dff_edge
x7 qa3 clka qa4 ra dff_edge
x2 db clkb qb1 rb dff_edge
x4 qb1 clkb qb2 rb dff_edge
x6 qb2 clkb qb3 rb dff_edge
x8 qb3 clkb qb4 rb dff_edge
.ends CD4015BC_edge