(1) It’s expensive (2) Everybody has to pay (3) The government’s gotta run it
Rob Mensching was supposed to monetize WiX by offering $5,000/yr enterprise consulting & support services. I guess that's not enough.
If I recall, SPF limits the number of domains you can enumerate in your DNS records.
Let the math to the math guys who never ship a product.
The secret is to check at every step that there is no "he's his own grandpa" loops in the user's tree, where (s)he inadvertently makes one of a person's descendants, also his ancestor. This happens sometimes because re-using the same names can cause confusion.
Recursion is like magic :o)
You can insert and delete when duplicating cards, by pressing with your fingers on the source or target card while typing on the keyboard.