Inputs:

2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23

Outputs:

15 (Registered, Output feedback registered, Active low)
16 (Registered, Output feedback registered, Active low)
17 (Registered, Output feedback registered, Active low)
18 (Registered, Output feedback registered, Active low)
19 (Registered, Output feedback registered, Active low)
20 (Registered, Output feedback registered, Active low)
21 (Registered, Output feedback registered, Active low)
22 (Registered, Output feedback registered, Active low)

Equations:

/rf15 := i2 & i6 & i7 +
         i6 & rf16 +
         i3 & /rf16 +
         i7 +
         /i4 +
         i6 & i7 +
         i4 & i7 +
         /i23
rf15.oe = OE

/rf16 := /i3 & /rf17 +
         /i4 +
         /i3 +
         /i3 & i4 +
         /i7 & rf17 +
         /i7 +
         i4 +
         i23
rf16.oe = OE

/rf17 := /i2 +
         /rf18 +
         i5 +
         i6 +
         rf18 +
         i4 +
         /i10 +
         /i23
rf17.oe = OE

/rf18 := /i2 & i5 & i6 & /i7 +
         i3 & i6 & i7 +
         i3 & rf19 +
         /i2 & /i7 +
         /i3 & /rf19 +
         i5 & i6 & /i7 +
         i7 +
         /i11
rf18.oe = OE

/rf19 := i5 & i6 & /i7 +
         i3 & i6 & i7 +
         i5 & rf20 +
         i6 +
         i7 +
         /i4 & /rf20 +
         /i7 +
         i10
rf19.oe = OE

/rf20 := i10 & rf17 +
         /i11 +
         i4 & /rf17 +
         i2 +
         /i6 & /i7 +
         i8 +
         /i9 +
         rf22
rf20.oe = OE

/rf21 := /i8 +
         /i2 & rf17 +
         i11 +
         /i10 +
         rf15 +
         /i14 +
         /i3 +
         i8 & i9 & /rf22
rf21.oe = OE

/rf22 := i14 +
         /rf15 +
         i3 & /rf21 +
         i7 +
         /i8 & rf21 +
         i10 +
         /i9 +
         i14 & /rf15
rf22.oe = OE