array of array pointers

How can I define an array so I can initialize it as following:

a[]=
{
{"aaa", "bb"},
{"Cccc"},
{"d", "eee", "fffff"},
}

The size of inner array is unknown.

Thanks

Excuse me if I'm wrong here, but this sounds like a homework question. We don't do homework unless you show that you've at least attempted an answer. What do you think the full declaration might be?