chainComplex(SpectralSequence) -- the underlying chain complex of a Spectral Sequence

i1 : A = QQ[x,y];

i2 : C = koszul vars A

      1      2      1
o2 = A  <-- A  <-- A
                    
     0      1      2

o2 : ChainComplex

i3 : K = filteredComplex C;

i4 : E = spectralSequence K

o4 = E

o4 : SpectralSequence

i5 : chainComplex E

      1      2      1
o5 = A  <-- A  <-- A
                    
     0      1      2

o5 : ChainComplex