for complement LUB(x,y)=1 and GLB(x,y)=0 for above diagram
LUB(a,b)=1 GLB(a,b)=0 so a and b are complement to each other.
LUB(0,1)=1 GLB(0,1)=0 so 0,1 are complement to each other.
for rest complement is not possible.
c,d,f,h,g,e will have 0 complement.