Puzzles - Missing letters puzzles

Start in the top left of the diagram and move to the right, then down one row and to the left, and finally to the right again. Letters are written in alphabetic order, in steps of 5 letters at a time.

Start with the A in the bottom left corner, and move in a clockwise spiral around the diagram towards the centre. Letters are written in alphabetic order, in steps of 6 letters at a time.

Start with the top left grid and move around the others in a clockwise spiral towards the centre. Letters follow alphabetic sequences, skipping 1, 2, 3 and 4 letters at a time, with their relative positions in each grid rotating 1/4 turn clockwise each time.