I'm not sure which variation will be used, but something has to change.

Sometimes variations can be used especially if more than one of a species is available.

This variation was used once again from December 3 to 31, 2012.

In practice, the last two variations are invariably used together.

I think it could be done using a variation of this man's technique.

Other than this, the four player rules apply, and any variations may also be used.

The variations are often used one after the other and to adapt to different situations.

Many variations on the design were used, but they mainly fell into two types.

Bath had used a variation of this move to score their first try.

All known variations of are used to write messages to another user.