Decision inviting the parties' observations on applications for participation of a/0001/06 to a/0004/06, a/0047/06 to a/0052/06, a/0077/06, a/0078/06, a/0105/06, a/0221/06, a/0224/06 to a/0233/06, a/0236/06, a/0237/06 to a/0250/06, a/0001/07 to a/0005