Singular

LIB "polybori.lib";
ring r=0,(x,y,z),Dp;
poly f=(x+1)*(y+1)*(z+1);
bpoly fb=f;
bset fs=fb;
from_boolean_set(fs);
==> zdd: 
==>  x1(x2(x3+1)+
==>        x3+1)+
==>     x2(x3+1)+
==>        x3+1
==> 
poly g=x*y*z+1;
bpoly gb=g;
bset gs=gb;
from_boolean_set(gs);
==> zdd: 
==>  x1(x2(x3))+1
==> 
ring R=0,(x(1..4)),Dp;
poly h=(x(1)+1)*(x(2)+1)*(x(3)+1)*(x(4)+1);
pyobject hb=boolean_poly(h);
def hs=hb.set();
from_boolean_set(hs);
==> zdd: 
==>  x1(x2(x3(x4+1)+
==>           x4+1)+
==>        x3(x4+1)+
==>           x4+1)+
==>     x2(x3(x4+1)+
==>           x4+1)+
==>        x3(x4+1)+
==>           x4+1
==>