How to define cross coverage for the selected range

In reply to dave_59:

i have tried first method,

but what i observed from the results, for r1 it is creating single bin instead of 16 bins.
same for r2,r3,r4 and i am getting remaining combinations which are not covered in r1,r2,r3,r4 but i dont want those…

when i am trying second method, iam getting compilation error

i gave like this
cross_A_B : cross A.a1,B.b1;

its giving hierarchical name not found, please correct me.

thnak you,
murali