Inputs:

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 21, 22, 23

Outputs:

17 (Combinatorial, No output feedback, Active high)
18 (Combinatorial, No output feedback, Active high)
19 (Combinatorial, No output feedback, Active high)
20 (Combinatorial, No output feedback, Active high)

Equations:

o17 = /i1 & /i2 +
      /i3 & /i7 +
      /i4 & /i8 & i16 +
      /i5 & /i6 +
      /i9 & /i10 +
      /i13 & /i15
o17.oe = vcc

o18 = i1 & i2 & i3 +
      i4 & i5 & i6 & /i14 +
      i7 & /i16 +
      i8 & i15
o18.oe = vcc

o19 = i9 & i10 & i14 +
      i13 & /i22 +
      /i2 & i5 & /i21 +
      i6 & /i7
o19.oe = vcc

o20 = i3 & i6 +
      i7 & i13 & i23 +
      i5 & i6 & i22 +
      /i7 & i11 +
      i21 & /i23 +
      /i1 & i3 & i6 & i7 & i10
o20.oe = vcc