In the introduction to the If you encounter problems and leave the rolls 48 Hrs before the song that can be walked. It is not a problem, so this is a standard method.
If problems are found in the primary coil and leave before 48 Hrs already made envelopes can be found nearby. No such problem This is a standard way to define them.
In the introduction, if problems are found and left roll up before Sung 48 Hrs. And found that can be used to walk, no such problem. Therefore determine how this standard.