Big and little letters
Why?
Every letter has a capital (upper-case) and a small (lower-case) form.
A big A and a little a stand side by side, then a big B finds its little b like a parent and child.
Press the button to match each big letter with its little letter.
Loading the 3D picture.
Drag the picture to look around.
Socks with D, d, E, e on them pair up on a washing line.
Interactive labs
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