Candy Crush Saga, how to make a colour bomb.

If you have trouble making colour bombs for some Candy Crush Saga levels, here is a pictorial guide to making them.
This is level 153 which requires you to switch 2 colour bombs together..

In the picture above you can see that if you move the green candy down one place by switching it with the red one you will have two pairs of greens with one green above the gap.