Orthomodular Lattices in Terms of the Sheffer Stroke

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A 3-basis for orthomodular lattices in terms of the Sheffer stroke.

    f(x,f(f(y,z),f(y,z))) = f(y,f(f(x,z),f(x,z))).  % A_SS
    f(f(x,x),f(x,y)) = x.                           % B_SS
    f(x,f(x,f(x,y))) = f(x,y).                      % OM_SS
These two Otter jobs show that this basis is definitionally equivalent to the (join/meet/complement) OML basis { AJ, B1, DM, OM }.
    otter < OML-SS.in > OML-SS.out
    otter < OML-SS-2.in > OML-SS-2.out
These three Mace2 jobs show that { A_SS, B_SS, OM_SS } is independent.
    mace2 -N6 -p < OML-SS-a.in > OML-SS-a.out
    mace2 -N6 -p < OML-SS-b.in > OML-SS-b.out
    mace2 -N6 -p < OML-SS-c.in > OML-SS-c.out