Spec.s1s2<-0
Spec.s1s3<-0
Spec.s2s3<-0
for (i in 1:3) {
  Spec.s1s2<-Spec.s1s2+abs(sum(spe.challenge[1,i]-spe.challenge[2,i]))
  Spec.s1s3<-Spec.s1s3+abs(sum(spe.challenge[1,i]-spe.challenge[3,i]))
  Spec.s2s3<-Spec.s2s3+abs(sum(spe.challenge[2,i]-spe.challenge[3,i])) }