code: func FindMissingElements(all []string, some []string) (delta []string) {
  all:
  	for _, v1 := range all {
  		for _, v2 := range some {
  			if strings.Compare(v1, v2) == 0 {
  				continue all
  			}
  		}
  		delta = append(delta, v1)
  	}
  	return
  }
docs: // FindMissingElements identifies the elements of the first slice that are not present in the second
  // The second slice is expected to be a subset of the first slice