default Snippets cat(final Iterable<Snippet> ss) {
final Snippets $ = make();
for (final Snippet s1 : this) for (final Snippet s2 : ss) $.add(s1.toString() + s2.toString());
return $;
}
default Snippets cut(final Collection<Snippet> ss) {
final Snippets $ = make(this);
$.removeAll(ss);
return $;
}
default Snippets cap(final Collection<Snippet> ss) {
final Snippets $ = make(this);
$.addAll(ss);
return $;
}