Foreach usage in randomization constraints

SystemVerilog
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12 
  
constraint value_c{
    foreach(c1[i]){
      (num == i) dist {1:=c1[i],0:=(100-c1[i])};
    }
    num inside {[0:($size(c1)-1)]};
    solve num before value;
    value inside {[a1[num]:b1[num]]};