how can I retrieve values from Nsmutable array having object with multiple values : I am beginner in objective-c/IOS development,

I have an NsMutablearray that has say 4 objects, and each object has further elements in it, I Want to retrieve those elements i.e.

Object at index 0 has 15 values( Ns strings) same is for rest of the 3 objects

I don't know the syntax of how can I read the values below syntax I have tried gives me error

    for(int i=0;i<[array count]; i++)
    {
    for (int j=0;j<[array[i] count]; j++)
    {
     /// reading code here
    }
    } 