*** I8 Tue,27 Jul 2010.14:41:47 ***
Cross z +-
Doublehelix 4z &-3.6-36.4.3-4.3.4.5.36-3.4.3-6.3-6.3.6.3.4-36-5.6.3.6.3-6.3-6.5.6-36.4.5.6.5-6.5.36-3.6-5
Zzz 2z +1