How to concatenate or add to crossed coverpoints

Coverage
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2

In reply to markiv:

You can only cross other coverpoints.

Can you define what you mean by summing a cross?

Without any explicit bins and a really big auto_bin_max, crossing two coverpoints is the same as a coverpoint of the concatenation of the two other coverpoint expressions

a : cross a_1, a_2;
// is the same as
a : coverpoint {a.b,a.a};