function (a,b,c,d,e){for(d=c=[];d++<b*b;)e=a[d-b-1]+a[d-b]+a[d-b+1]+a[d-1]+a[d+1]+a[d+b-1]+a[d+b]+a[d+b+1],c[d]=e==3||a[d]&&e==2;return c}