This book has 41 blends, where letters keep their individual sounds when placed together.

Three important concepts come into play here:
that written letters in pairs and groups need to be seen with a left to right eye movement;
that when converting visual graphemes to aural sound, they need to be said in a smooth left to right sequence;
and that a flow of air from the lungs needs to join – i.e. blend – these letter sounds together.