func (ioc IOController) Send(i int, x slices.ISlice) {
go func() {
c := make(slices.ISlice, 0, x.Len())
copy(c, x)
ioc[i] <- c
}()
}
func (s iset) String() (t string) {
elements := slices.ISlice{}
s.Each(func(v int) {
elements = append(elements, v)
})
slices.Sort(elements)
return elements.String()
}