protected final void toString(StringBuilder sb, LiRhsPart[] parts, String separator) {
boolean first = true;
for (LiRhsPart p : parts) {
if (first) {
first = false;
} else {
sb.append(separator);
}
p.toString(sb);
}
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
toString(sb);
return sb.toString();
}