Singular

LIB "gfan.lib";
intmat M1[2][2]=
1,0,
0,1;
cone c1=coneViaPoints(M1);
intmat M2[2][2]=
1,1,
1,-1;
cone c2=coneViaPoints(M2);
intmat M3[2][2]=
1,0,
0,-1;
cone c3=coneViaPoints(M3);
cone c12=convexIntersection(c1,c2);
c12;
==> AMBIENT_DIM
==> 2
==> FACETS
==> 0, 1,
==> 1,-1
==> LINEAR_SPAN
==> 
==> 
print(rays(c12));
==> 1,0,
==> 1,1
cone c23=convexIntersection(c2,c3);
c23;
==> AMBIENT_DIM
==> 2
==> FACETS
==> 0,-1,
==> 1, 1
==> LINEAR_SPAN
==> 
==> 
print(rays(c23));
==> 1, 0,
==> 1,-1
cone c13=convexIntersection(c1,c3);
c13;
==> AMBIENT_DIM
==> 2
==> FACETS
==> 1,0
==> LINEAR_SPAN
==> 0,1
==> 
print(rays(c13));
==> 1,0