0=return Math.exp(-3.9+0.1*group.getLength())/(1+Math.exp((-3.9)+0.1*group.getLength()));
1=return Math.exp(-28+0.6*group.getLength())/(1+Math.exp((-28)+0.6*group.getLength()));
2=return Math.exp(-7.5+0.1*group.getLength())/(1+Math.exp((-7.5)+0.1*group.getLength()));
3=return Math.exp(-3.5+0.1*group.getLength())/(1+Math.exp((-3.5)+0.1*group.getLength()));
4=return Math.exp(-6.2+0.2*group.getLength())/(1+Math.exp((-6.2)+0.2*group.getLength()));