BEGIN {
      srand();
      OFS=","; 
      generate() 
      }

function generate(a,b,c,d, recall,\
		  bd,   bdMin,  bdMax,   \
		  acc,  accMin, accMax,  \
		  prec, precMin,precMax,      \
		  n) {
  bdMin = 0.03;  bdMax = 0.2;
  accMin = 0.7;  accMax = 1.0;
  precMin = 0.3; precMax = 0.5;
  while (n <= 1000 ) {	 
    a=rand();		 
    b=rand();		 
    c=rand();		 
    d=rand();
    bd = b + d;
    acc = (a+d)/(a+b+c+d);
    prec = d/(c+d);
    recall = d/(b+d);
    if ( bd   >= bdMin   && bd   <= bdMax &&
	 acc  >= accMin  && acc  <= accMax &&
	 prec >= precMin && prec <= precMax ) {
      n++;
      print prec,recall | "sort -n -t, +0";
    }
  }
}