Hierarchy	Input	Constant Input	Unused Input	Floating Input	Output	Constant Output	Unused Output	Floating Output	Bidir	Constant Bidir	Unused Bidir	Input only Bidir	Output only Bidir
u2	4	3	0	3	7	3	3	3	0	0	0	0	0
u1	4	0	0	0	7	0	0	0	0	0	0	0	0