Some forms of the game require the coin to hit the wall to be a valid throw.

Regardless of its cause, the benign form typically does not require medical treatment.

This form of treatment is still relatively new and requires much more testing before being widely used.

However, even this form of tourism may require foreign investment for promotion or start up.

Each new form requires only one shot to be either destroyed or changed into the next one.

The latter form requires a minimum level of salt to survive.

Sometimes an additional form requires a signature from each flight attendant.

All other forms of power generation also require back up, though to a lesser extent.

The forms require information to be provided which will establish that the court has jurisdiction.

The new forms require more information about the immigration status of a potential customer.