for(E e = this.e; e!=null; e=e.pair.next==this.e?null:e.pair.next) {
if (Math.abs(e.crossAngle()) > (Math.PI * 0.9) || Math.abs(e.next.crossAngle()) > (Math.PI * 0.9)) illegal = true;
if (e.t.aspect() < 0.1) illegal = true;
for(E e = this.e; e!=null; e=e.pair.next==this.e?null:e.pair.next) {
if (Math.abs(e.crossAngle()) > (Math.PI * 0.9) || Math.abs(e.next.crossAngle()) > (Math.PI * 0.9)) illegal = true;
if (e.t.aspect() < 0.1) illegal = true;