There are two kinds of zeros in the highest order,

0 is not at the top, there are 2×2=4 kinds of digital cards, each of which forms 2 spaces (not including both ends), and ***4×2=8 kinds.

So you can put in 2+8= 10 different decimals.

Use two numbers.

There are a (3 3,2) = 3× 2 = 6 kinds.

So it can be set to 10+6= 16 with different decimals.

I wish you happiness.