The rules that were made in 1865 still exist today.

When are you going to realize that rules exist for a reason?

No one is sure why this rule exists, because it's not 1941 anymore.

Yet no international rules exist on what's fair or unfair.

These rules can be exploited, but exist because they are generally successful.

And there are people who sincerely believe that rules exist.

Strict rules exist as to which type of a bow should be used at any particular time.

Since this is a very common game, many different rules exist depending on the conventions of its players.

However no official rules or models exist for these types of units.

Now the realization struck him that the rules he had always played by didn't exist.