All the other amino acids and their position are exactly the same or is exactly the same. So whenever an insertion or a deletion takes place in multiples of three, this does not lead to a shift in the reading frame. And such mutations are known as non frame shift mutations because all the amino acids that would be produced if there was no mutation are still produced. And this usually leads to either a fully functional protein or a partially functional protein. And if we compare to the frameship mutation, that usually leads to a non functional protein. So, basically, insertions or deletions do cause frame shift mutations, but not always.