func (s MoRefSorter) Swap(i, j int) {
	s[i], s[j] = s[j], s[i]
}
func (s MoRefSorter) Swap(i, j int) {
	s[i], s[j] = s[j], s[i]
}
func ( s MoRefSorter ) Swap ( i , j int ) { s [ i ] , s [ j ] = s [ j ] , s [ i ] }
// Swap helps implement sort.Interface for MoRefSorter.
Swap helps implement sort . Interface for MoRefSorter .