The document consists of a series of subtraction problems involving numbers from 0 to 20, focusing on various equations like '16-5=?', '12-8=?', and '12-12=?'. The solutions to these problems are provided alongside the equations. The document concludes with a friendly message to the readers.

1. Subtraction 0 to 20

2. 16-5=?
1 2 43 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
16 - 5 = 11

3. 12-8=?
1 2 43 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
12-8=4

4. 12 - ? =4
1 2 43 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
12-4=?
12-4=8

5. 12 - 12 =?
1 2 43 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
12-12=0
0

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