i generate three digit from crossover with another digit but now i valid only that child1+chi​ld2+child3​..(in this sequence) which total is less than or equal to 9

bins=fliplr(de2bi(entry,8));
  swappedcolumns = [4 5 6];
  child = bins;
  swapoddeven = reshape([2:2:size(bins, 1);
  1:2:size(bins, 1)], 1, []); 
  child(swapoddeven, swappedcolumns) = child(1:size(bins, 1), swappedcolumns);
  bincon=bi2de(fliplr(child(:,:)));
  cross1=reshape(bincon,6,3);

here 18 child create but i want child1+child2+child3<=9 generate otherwise process with anotherone

entry matrix is random matrix 6*3 (digit between 0 to 9)