2.104—Contents of opposition.
(a)
The opposition must set forth a short and plain statement showing why the opposer believes he, she or it would be damaged by the registration of the opposed mark and state the grounds for opposition.
(b)
Oppositions to different applications owned by the same party may be joined in a consolidated opposition when appropriate, but the required fee must be included for each party joined as opposer for each class in which registration is opposed in each application against which the opposition is filed.