Determine which legal clause the following paragraph belongs to: ( a a)  specifies the relevant event referred to in paragraph 10( a) which has occurred in relation to the Defaulting Party;  ( bb)  states that the non- Defaulting Party, having made all practicable efforts to do so, including having attempted to use atleast two of the methods specified in sub- paragraph( b) ( ii) , ( ii) or( v) , has been unable to serve a