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	2	0	0	0	2	0	0	0	0	0	0	0	0
u1	2	1	0	1	2	1	1	1	0	0	0	0	0