text: In this example, the following sentence with three-letter words makes sense when read from the beginning:
   |Start|THE CAT AND THE MAN ARE FAT ...
   |Start|123 123 123 123 123 123 123 ...
  However, if the reading frame is shifted by one letter to between the T and H of the first word (effectively a +1 frameshift when considering the 0 position to be the initial position of T),
   T|Start|HEC ATA NDT HEM ANA REF AT...
   -|Start|123 123 123 123 123 123 12...
  then the sentence reads differently, making no sense.