function arr = insert (arr, key, k)
  n = length(arr);
  
  for i=1 : k
    
    key = [key num2str(i)] ; 
    address = string2hash(key);
    address = mod(address,n)+1;
    
    printf(1,"key = %s -> pos = %d\n",elem,pos)
    arr(address)=1;
%%%%%%

  end
end