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covergroup cg with function sample(bit [2:0] size, bit [1:0] qos);
  cp_size: coverpoint size {
    bins small = {[0:3]};
    bins big   = {[4:7]};
  }

  cp_qos: coverpoint qos {
    bins low    = {0};
    bins high   = {1};
    bins urgent = {2};
  }

  x_sz_qos: cross cp_size, cp_qos {
    bins big_high   = binsof(cp_size.big)   && binsof(cp_qos.high);
    bins big_urgent = binsof(cp_size.big)   && binsof(cp_qos.urgent);
    bins small_low  = binsof(cp_size.small) && binsof(cp_qos.low);
    ignore_bins rest = default;
  }
endgroup

initial begin
  cg c = new();
  c.sample(6,1);
  c.sample(7,2);
  c.sample(2,2);
end