This code give me 20 subsample. But i want no of subsamples that cover only the main sample.Means program may give 6 or 10 or any no of subsample but when it cover the whol sample it will stop executing. Any suggession please help me.

 sample=datasample('ATCG',20);
display(sample);
i=1;
for k= 1:numel(sample)
    subsamplelength =  randi([5 10]);
    subsamplestart = randi(numel(sample)-subsamplelength+1); 
    subsample{i}= sample(subsamplestart : subsamplestart+subsamplelength-1);
    i=i+1;
end
display(subsample);